onionbag Share definition Flag The yambag, for Crissakes. What did you think? My onionbag smells musty--then again, it's 80 degrees. Ballsweat--what a bastard. onionbag by Onionbag January 6, 2007 0 0 Get merch Get the onionbag mug. Buy Now — $32.95 See more merch