Will-Bag Share definition Flag 1. Noun. a white trash asshole uncle that shits in a bag. 2. Adj. a white trash asshole. 1. You aren't inviting Will-Bag to our reunion are you? 2. Dude, stop being a fucking Will-Bag Will-Bag by cinco November 13, 2004 0 0 Get merch Get the Will-Bag mug. Buy Now — $32.95 See more merch