spice rub Share definition Flag When you borrow someone's underwear or swimsuit and you rub your ass on it, leaving some poop remnants behind. Thanks for letting me borrow your swim suit. I gave it the spice rub. spice rub by eatmorchickn August 19, 2009 0 0 Get merch Get the spice rub mug. Buy Now — $32.95 See more merch