As far as urban slang, the definition is "to show off." Used by many rappers, most notable Ice Cube and the Geto Boys. Originated in the urban community, and has been used for quite some time.
"...no flexin', didn't even look in the nearest direction as I ran the intersection. (This is said because Ice is trying to get away from some people who tried to kill him the other day In the song, of course)" -Ice Cube, "It Was a Good Day"
by The Boston Rag February 27, 2005
by TrapKingzofIslip August 08, 2015
by SirEli April 29, 2010
by ablazingape May 09, 2012
by andre.. February 23, 2005
by whitepplrstupid July 05, 2005
A substance added to street drugs to increase the weight of the product, allowing more profit to be made, but in return, usually taking away from the drug's original potency and lowering it's side effects.
by Nah Uh July 09, 2015