another form of saying, "what is going on at the moment?"
say, foo, what's POPPING!?
Or whats poppin. This is a way of asking someone what they are up to or what is going on. The same as whats popple loppin?, whats crackin, whats crackalackin, Whats Hood, whats da deal? or wots gwanin.
What's popping G?
I'm gonna call Titch and see what's popping.