UB Slut Share definition Flag One who likes Urban Dictionary and looks up the terms they put on just to see it online and do thumbs up. Sean: Haha my new word got 65,000 thumbs up! Evan: Uh... How? Sean: Uh... I'm a UB slut UB Slut by The_Straight-Edge_Donkey July 6, 2011 0 0 Get merch Get the UB Slut mug. Buy Now — $32.95 See more merch