bum bats Share definition Flag bits of shit and toilet paper that get stuck in bum hair following a visit to the shitter. Resembles bats hanging in caves. Dang, I got a bunch of itchy bum bats hangin in my butt crack. bum bats by JackSparrow24 February 13, 2008 0 0 Get merch Get the bum bats mug. Buy Now — $32.95 See more merch