LOUISVILLE BATBOY Share definition Flag When a male partner swings his penis on his partners sack, what a GRANDSLAM!!! Tony and Pedro worked up a LOUISVILLE BATBOY at the 7th ending stretch. LOUISVILLE BATBOY by tonymckentucky September 8, 2007 0 0 Get merch Get the LOUISVILLE BATBOY mug. Buy Now — $32.95 See more merch