C-U-know what Share definition Flag a way to spell "cunt" or "C-U-N-T" without having to spell the whole thing; a play on words "I'm done with that C-U-know what. She's triflin." C-U-know what by Adolf Oliver Bouchere May 27, 2008 0 0 Get merch Get the C-U-know what mug. Buy Now — $32.95 See more merch