Speedo Torpedo Share definition Flag A bulge in a person's swimwear caused by either an erection or extreme tightness. "That dude has a Speedo Torpedo so big it could sink a battleship." Speedo Torpedo by ErnieTheGreatest November 8, 2014 0 0 Get merch Get the Speedo Torpedo mug. Buy Now — $32.95 See more merch