Slippery Bum Share definition Flag Someone who is slippery, smooth, and can slip through your fingers quickly. Good in any situation. We're trying to turn Black Barrier into a slippery bum so he doesn't die. -Nicor Slippery Bum by Syphonics October 7, 2008 0 0 Get merch Get the Slippery Bum mug. Buy Now — $32.95 See more merch