Wats poppin could be used as a greeting to a peer or friend;it also is known as a gang related term used between "Bloods"
"Yo wats good mah nigga...Yo wats poppin Blood"
by dimmit July 03, 2007
WHATS UP ,WHATS GOING ON,HOW ARE YOU
WHEN YOU MEET SOMEBODY YOU SAY WATS POPPIN
by BRISCObabi December 25, 2008