Bum kernel Share definition Flag 1. someone who reminds you of th smelly reminents left on your buttcheeks after a particularily raunchy dump ohh man im going have to check for bum kernels after laying that log! Bum kernel by Mad_kristoff September 26, 2010 0 0 Get merch Get the Bum kernel mug. Buy Now — $32.95 See more merch