bat chunk Share definition Flag something that a really lame poopy person calls you when they are being dumbos. or, it could be a misunderstanding and they are really saying "fat monk." idiot: hahah you are such a bat chunksane person: ... bat chunk by lemon(: June 29, 2009 0 0 Get merch Get the bat chunk mug. Buy Now — $32.95 See more merch