Pontoon Boat Share definition Flag A motorboat, but in between the butt cheeks instead of the boobs. Did you see Jack Pontoon Boat that stripper last night? He got his face right up in those butt cheeks. Pontoon Boat by MooseMan5 September 17, 2010 0 0 Get merch Get the Pontoon Boat mug. Buy Now — $32.95 See more merch