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1.
A type of rap music made popular artist Esham, which includes aggressive hip-hop beats and many aspects of rock music. Horrorcore is said to have spawned from this style.
"Modern day blues" - Esham
by Hagaki June 19, 2003
 
2.
new wave of rap emerging along side molly rap, generally more creative due to artist's "trippy" experiences with psychedelics such as shrooms and LSD. Chance the Rapper, Flatbush Zombies, and Underacheivers are all examples of "acid rap."
That acid rap music video was crazy, I tripped while watching it sober!
by masterEd April 15, 2013
 
3.
A shitty mix of metal or rock and rap music; Origin credited to Esham but more likely to have been created by Run DMC and Aerosmith with "Walk this Way"

Something Marilyn Manson would come up with if he was born a black man

The music Linkin Park and Evanescence would make if they were into pedophilia, the Illuminati and Osama Bin Laden

Characterized by rap verses with cheesy punchlines like "I'm a rapist", "I fuck corpses", "I shoot people in school" etc.

Is preferably called acid crap
BORN LOSER: I love listening to acid rap like Insane Clown Posse and other Psychopathic Record juggalo artists

BORN WINNER: Nah, those came from the anus of a wino infected with aids and leprosy. Listen to some quality rap metal like Biohazard's "Urban Discipline" and that album Judgment Night movie soundtrack, not that acid crap horseshit
by Big Kahuna Foot Massage November 06, 2012