Also used in other appropriate settings where participation or action is necessary.
"John--kill this beat! go in!"
Jared: "That girl looks so fine over there. I want to talk to her."
Andy: Well, go in!
Jerome went in DEEP on Quincy at the lunch tables, had everyone dyin' but had him cryin' after baggin' on his dead pops.
Martin Lawrence used to go in on the audience on Def Comedy Jam