1 definition by kittybaby7

FUI

fucking under the influence. having sex while also experiencing the effects of drugs, alcohol, etc. FUI is the 8th deadly sin and is punishable by a 6 month suspension of your fucking license.

Dude I don't remember her at all...I must have been FUI, I don't even remember her name.

by kittybaby7 June 17, 2007

Get the FUI neck gaiter and mug.