Involuntary Rap
When a mentally unstable man unexpectedly yells vulgar rap lyrics at you. Usually located on or near a college campus.
Jennifer: I really liked that movie!
Liz: Yeah it was-
Scary Man: "I LIKE A FREAKY BITCH, KNOWS HOW TO SUCK MY DICK, GIVES ME INSANE BRAIN AND THEN SHE SWALLOWS IT."
Jennifer: What the fuck just happened?
Liz: Involuntary Rap.