HBC Share definition Flag Heart Breaking Cunt. Someone who breaks up with you in a most outrageous manner, i.e. over MSN, on facebook wall, etc. That HBC just broke up with me the other day over a text message, what a bitch! HBC by U. Nanimous March 4, 2008 0 0 Get merch Get the HBC mug. Buy Now — $32.95 See more merch