Flounder Pounder Share definition Flag A guy that bangs his gf's "Flounder/Vagina" with a vengeance...A FLOUNDER POUNDER... Mike is such a Flounder Pounder, you can tell becuase his girlfriend walks funny.... Flounder Pounder by PokemNthepink January 5, 2011 0 0 Get merch Get the Flounder Pounder mug. Buy Now — $32.95 See more merch