That really was a low blow.

The diminutive “Bagel Boss Guy” chickened out of his much-touted celebrity boxing match at the very last minute — then cruelly laughed at those who had paid to see him.

“I fooled you all!” Chris Morgan cackled wildly in a video on social media, later admitting that he did not even warn his own family that he’d be a no-show for Saturday’s heavily-hyped Atlantic City bout.

“I ain’t coming to the fight! After all, what’s the best way to really not get hit? Don’t be there!”

Morgan — who gained fame in July for getting roughed up at a Long Island Bagel Boss while ranting about women — came up with a bunch of excuses Sunday, blaming the “s–show” event for only selling 90 tickets and underpaying him.

But the 5-foot-nothing Long Islander eventually admitted he was too scared to fight actor Dustin ‘Screech’ Diamond, saying the “Saved by the Bell” star was “bigger, younger, faster, stronger.”

“Are these people f—ing insane? Even I admit it was a mismatch,” he said in a live video early Sunday, admitting he was already “stoned.”

“I wasn’t about to get most-likely killed by a younger, bigger guy” where half his earning would probably go on medical bills, he whined.

“They just wanted to make money and humiliate me and I outsmarted their ass. So I didn’t f—ing go,” he said, admitting he forgot to warn his dad and cousin who traveled to Atlantic City for the event.

Morgan also admitted in another online video that he refused to fight because he realized new-found “fans” were only there because they “wanna see me get pummeled in the ring and die.”

“They wanna see me get beat to a bloody pulp and possibly even death in front of my family. You would all love to see the humiliation,” he ranted in a video full of fresh misogynistic rants about his doomed dating life.

Celebrity Boxing promoter Damon Feldman called Morgan an “out-and-out disgrace” and vowed “big legal trouble.”

“My attorneys are looking into filing a private criminal complaint for grand theft larceny because he took money under false pretenses and never had any intention of showing up,” Feldman told The Post.

The much-publicized bout was long-troubled, with his initial opponent, MLB star Lenny Dykstram, abruptly backing out days before the bout.

It seemed to be fittingly saved by the bell by Diamond, the 42-year-old actor who found fame with the show of the same name, before Morgan failed to show on the night.

Former wrestler Matt Wolfe stepped up to replace him, Feldman said — getting knocked out with the very first punch, leading to a loud chorus of already upset fans, video of the clash shows.