Gravy bag Share definition Flag A condom AKA a thin rubber sheath worn on a man's penis during sexual intercourse as a contraceptive or as protection against infection pregnancy and STIs. "I just came in a gravy bag" "Gravy bags prevent pregnancy and STIs" Gravy bag by Bitty15 November 14, 2018 0 0 Get merch Get the Gravy bag mug. Buy Now — $32.95 See more merch