Poppenin Share definition Flag A word derived from the combination of "Poppin" & "Happenin". "Yo Tone, What's poppenin?" or "Damn son, That party last night was poppenin" Poppenin by Mr. 2 Fly 4 Gravity October 18, 2009 0 0 Get merch Get the Poppenin mug. Buy Now — $32.95 See more merch