throw it up
v. phr.β Β«She and other deputies exchange gang information. “Kids try to fly in under the radar, try to keep their gang links secret.” But, she said, you might see a student “throwing it up,” jargon for making gang hand symbols, and thatβs when she moves in.Β» ββResource officer battles gang activity” by Hugh Muir Free Lance-Star (Fredericksburg, Maryland) Nov. 6, 2007. (source: Double-Tongued Dictionary)