Green’s Dictionary of Slang

1. (US gang) to attack another gang; thus as n.

1993		Snoop Doggy Dogg ‘Murder was the Case’ 🎵 Just remember who changed your mind / Cuz when you start set-trippin, that ass is mine.
1995		Coolio ‘Gangsta’s Paradise’ 🎵 I really hate to trip but I gotta loc / As they croak, I see myself in the pistol smoke.
1996		P. Beatty White Boy Shuffle 100: Take a set trip, load the clip, cruise the strip, give a punk-ass buster a hellified fat lip.
1999		Dr Dre ‘Bitch Ass Niggaz’ 🎵 No mo’ talkin, I’m walkin and I’m poppin the clip / Glock on the hip, set-trippin dippin an’ shit.
2001		(con. 1990s) in J. Miller One of the Guys 86: ‘Talk about [...] who’s tryin’ to trip, who is after, who we’re after’.

2. (US prison) to move from one gang to another.

1998

Austin American-Statesman (TX) 14 Oct. 9/4: Texas Prison Gangs Slang [...] Set tripping: To switch from one gang to another.