chuscular Share definition Flag a guy who looks muscular in a shirt but is actually chubby or flabby when he's naked girl 1: that guy you hooked up with last night was pretty buff.. girl 2: i thought so too. he was just chuscular. chuscular by om627 July 19, 2011 0 0 Get merch Get the chuscular mug. Buy Now — $32.95 See more merch