Boom-a-Wang Share definition Flag When a male sends a picture of his junk to a complete stranger and gets one in return, hence, Boom-a-Wang. We told Tim to send a picture of his junk to a random number, he got a Boom-a-Wang Boom-a-Wang by FriendlyNeighbourhoodVigilante October 14, 2013 0 0 Get merch Get the Boom-a-Wang mug. Buy Now — $32.95 See more merch