An accused teenage rapper pleaded not guilty today to making a bomb threat on Facebook he warned would eclipse the horror of the Boston Marathon tragedy and make him “famous.”

Methuen High student Cameron D’Ambrosio, 18, who calls his rapping alter ego “Cammy Dee” in crude, profane YouTube videos, was ordered held without bail by Lawrence District Court Judge Lynn Rooney pending a May 9 dangerousness hearing after waiving his right to a bail argument.

“I’m not in reality, So when u see me (expletive) go insane and make the news, the paper, and the (expletive) federal house of horror known as the white house, Don’t (expletive) cry or be worried because all YOU people (expletive) caused this (expletive),” read the social media posting that raised alarms with high school assistant Principal James Weymouth when another student called it to his attention.

The rant only got more disturbing from there as it continued, “(Expletive) a boston bominb wait till u see the (expletive) I do, I’ma be famous rapping, and beat every murder charge that comes across me!”

Chained at the wrists and ankles and wearing a black T-shirt featuring the late hip-hop artist ODB, D’Ambrosio sat in court with his head hung between his knees.

He faces up to 20 years in state prison if convicted on one count of making a bomb threat.

“I’m not going to make any comments about the case,” his attorney Geoffrey DuBosque later said. “I just met him and I need to meet with him in private.”

Assistant Essex District Attorney Kelleen Forlizzi did not go into detail about the case during the teen’s arraignment. Court records and police reports later released show police were at D’Ambrosio’s home with a search warrant yesterday and seized an XBox 360 gaming console, and computer equipment.

D’Ambrosio was charged last year with threatening to stab his sister to death. The case was dismissed last month.

He admitted to an officer yesterday having written the Facebook posting, according to court records. At the station prior to his booking, police said he “refused” his right to make a phone call.