Mega-bitch Share definition Flag Someone who complains seemingly for the sport of it, or a person who invokes a serious loathing. "Oh, quit being such a Mega-bitch!" "Is it? It is! The mega-bitch!" Mega-bitch by KAI July 7, 2004 0 0 Get merch Get the Mega-bitch mug. Buy Now — $32.95 See more merch