poppin' a cap in yo a** Share definition Flag a slang african american saying used for a threat of shooting someone with an AK-47. poppin' a cap in yo a**. hiihihihihihih poppin' a cap in yo a** by Jeff hi June 11, 2006 0 0 Get merch Get the poppin' a cap in yo a** mug. Buy Now — $32.95 See more merch
