This love is terrifying.

Thousands of American teen girls are crushing on Boston Marathon bomber Dzhokhar “Jahar” Tsarnaev, 19 — and leading a social-media movement to exonerate him.

The swooning teens will not accept allegations that the bushy-haired college kid — whom they refer to by his nickname, “Jahar” — and his brother, Tamerlan, 26, killed three and maimed hundreds by setting off bombs at the April 15 race and killed an MIT police officer during the ensuing manhunt.

While some scrawl the hashtag “#FreeJahar” on their hands with markers, an 18-year-old in Topeka, Kansas, is going to the extreme — she wants the Dzhokhar’s words inked on her arm forever.

“Getting one of Jahar’s tweets tattooed on me tomorrow. Guess you could say I’m a #FreeJahar supporter,” “@keepitbluntedd” tweeted on May 7.

The tatted-up teen, Alisha, told The Post she’d soon put Tsarnaev’s April 7 tweet on her upper inside of her arm. It will read, “If you have the knowledge and the inspiration all that’s left is to take action.”

The waitress insists she believes Tsarnaev is innocent because the evidence against him doesn’t add up. She read through all of his tweets.

“He was just this pothead 19-year-old boy who didn’t care,” she said. “I don’t see it.”

She said she’s “[taking a] stand for what you believe in even if everybody else doesn’t believe it.

“We live in this country where we are innocent until proven guilty and it’s not our job to prove that he’s innocent. It’s the government’s job to prove that he’s guilty,” she added.

She says she’s not a groupie.

“I feel like he doesn’t have a voice. Somebody needs to stand up for him and not the little high-school girls who just think he’s cute,” Alisha said.

“@FreeJahar97,” who identified herself on Twitter as “Gianna,” a 16-year-old with “big boobs,” likened Tsarnaev to a heartthrob.

“Yes i like Justin Bieber and i like Jahar but that has nothing to do with why i support him. I know hes innocent, he is far too beautiful,” she tweeted on April 25.

Another fan is Ariel Barnes, 19, of Columbus, Ohio, unemployed and hoping to snag a job at Walmart, has never met Tsarnaev.

“I try to make it a point that I’m not a fangirl,” Barnes said. “I feel like he’s my brother.”

As “@Shadowlily1993,” she tweeted to critics: “Yall can judge me as much as you want. I’m on his side. This kid needs people behind him. . . . I hope to meet him one day he fascinates me.”

On YouTube, she compiled a playlist inspired by Tsarnaev’s tweets that includes Death Cab for Cutie’s “Tiny Vessels,” Jay-Z’s “99 Problems” and Wiz Khalifa’s “Mezmorized.”

A Tsarnaev pal from Chelsea, Mass., Troy Crossley, 20, refers to supporters as “family.” He now has 16,333 followers on Twitter.

“I feel like I am a family member of him and I don’t understand the girls who do that, especially with him being suspected as a terrorist,” Barnes added.

“A lot of his Twitter posts come from lyrics of a song. That’s just me figuring out the songs and trying to widen my musical taste,” Barnes said.

Other videos include “Jahar’s porn,” a clip of bumblebees getting busy and one repost of the teen dancing.

“Jahar is only six days older than me and it just really hurts to think that someone my age that has so much potential and was so happy to be a US citizen would do something like this,” she said.

A Facebook group, Dzhokhar Tsarnaev Free Jahar Movement, has more than 6,000 followers. A post on its page asks whether the brothers were “actors” who believed they were taking part in an emergency drill at the marathon.

Dzhokhar has inspired anonymous authors to pen steamy online fan fiction, as well.

On Wattpad, “Stringcheesekitteh” wrote the three-part story “Tsarnaev,” set in the prison medical facility where Dzhokhar is being held. In the tale, a young resident psychiatrist finds herself mesmerized by his eyes — and flirting with danger.

The author wrote that the story was not meant to “offend anyone” and did not express “strong sentiments for or against the suspect.”

Anonymous works on Pastebin.com include fantasy sex and romance scenes with the terrorist.

One scribe imagined Tsarnaev having one last moment of intimacy before getting arrested.

“He kissed your neck, sucking on it to leave his mark, biting down on it every now and then,” reads one scene set just before his arrest.

The fictional Tsarnaev responds, “Cmon, baby give me something to think about in jail.”

Another tale imagines the day he is set free.

“ ‘I missed you like hell. I was a mess without you, don’t ever leave me please,’ I said as I bought [sic] my fingers up to his ear, running them through his curls.”

Tsarnaev’s looks and online persona — his joking tweets, photos and a video clip of him dancing — are candy for his worshippers.

On Instagram, “Izzyperez007,” posted a collage of Dzhokhar. “Love you Jahar and support you!!” the user gushed.

When commenters called her “crazy” and “obsessed,” she wrote, “I am going to make shorts that say #FreeJahar on my butt,” she wrote in comments.

On Instagram, “_saraforjahr_” keeps a daily countdown of the days left until Tsarnaev’s May 30 hearing. On Thursday, she posted a shot of Tsarnaev’s mop of curls flopping as he wrestled another boy. “He will be free whether the government likes it or not!” she wrote.

Tumblr blogs are springing up, too. Justice for Jahar is decorated like a teenybopper mag, with a collage of his pics with the words “luv u,” “perf,” and “fab” in pastel pink embellishing it.

The blog is designed by a young woman in the Netherlands. She declined an interview.

One Twitter user “@freejaharlove” on Friday tweeted, “#FBI please put me inside prison with Jahar I cannot tolerate you lies anymore.” The tweeter also waxed poetic, writing, “I am only the dust on my Lover’s (Jahar) path and from dust I will rise and turn into a flower.”

Online messages encourage supporters to write to Tsarnaev at Devons Federal Medical Center in Massachusetts.

Girls crazy for killers is not uncommon, says Sheila Isenberg, author of “Women Who Love Men Who Kill,” noting serial killer Ted Bundy had his share of fans.

“Ted Bundy had a huge coterie of groupies. Young women, teenage girls, women in their 20s, who went to court everyday, and followed his trial,” Isenberg said.

“Jahar has his groupies because of social media. They are able to get in touch with each other and whip up a frenzy about him,” she said.

Sooner or later, Isenberg said, young women will find ways to directly correspond with him — either attracted by the upper-hand position in the relationship or the 15 minutes of fame it’ll bring.

“It’s easier to get a date with this Jahar guy than it is with Leonardo DiCaprio.”“It’s nota normal healthy thing just to make sure he gets a fair trial to tattoo the words of a the Boston Bomber on your body,” Isenberg said