Gains Stealer Share definition Flag Someone who always takes your food or asks for some when your trying to make gains. Henok: Yo, gimmie some!Alex: Bro get your hands off my nuts you gains stealer! Gains Stealer by SexualMilk May 16, 2014 0 0 Get merch Get the Gains Stealer mug. Buy Now — $32.95 See more merch