Boob-Backer Share definition Flag 1. Men who's fat forms breast-like appendages on their backs. 2. An overweight individual "I don't think he's that fat." "What are you talking about? Dude's a boob-backer!" Boob-Backer by Totalimmoral September 12, 2008 0 0 Get merch Get the Boob-Backer mug. Buy Now — $32.95 See more merch