outie-bum Share definition Flag Much like an outie belly button; 'outie-bum' is where a portion of the rectum actually protrudes outside the anus. When she bent over, all I noticed was her outie-bum. outie-bum by PeeJ July 1, 2012 0 0 Get merch Get the outie-bum mug. Buy Now — $32.95 See more merch
