nega-boobs Share definition Flag The unflattering accumulation of fat on a man's pecs. Nega boobs are unlike manboobs because they are always caused by fat. Wow, Louis, your working out is paying off... You've got nega-boobs no more! nega-boobs by Nazzy Wazzy April 10, 2008 0 0 Get merch Get the nega-boobs mug. Buy Now — $32.95 See more merch