jock stuffing Share definition Flag When someone stuffs their jockstrap or underwear with something (tissue, socks, etc.) to make their penis look larger. Girl 1: Woah, that guy's HUGE! Girl 2: No, he's just jock stuffing... jock stuffing by fire.weaver.edan January 11, 2009 0 0 Get merch Get the jock stuffing mug. Buy Now — $32.95 See more merch