Top Definition
Fucking Useless Information. What most emails you receive marked FYI really are.
"I wish he would stop CCing all of us on emails FYI. More like FUI".
by Anton Vettel December 03, 2009
FUI: Facebook Under the Influence. The act of writing, participating, or using Facebook, or any other social network while intoxicated. The modern extension of drunk dialing.
I never should have messaged he/she last night on Facebook. I was so FUI! Now I'll never get in his/her pants!
by Dr. Basketcase December 16, 2008
Facebooking Under the Influence.
"Dude, I should get an F.U.I. I got on Facebook last night after the party and called my X a cheating whore on her wall!"
by Auraten January 27, 2010
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
Facebooking Under the Influence.

The modern equivalent of the Drunk Dial.

When you wake up to find that you or one of your friends has posted comments that they would usually censor.
Last night I got caught F.U.I. again, that photo of my nipple was supposed to be a private message not a wall post.
by fouii January 14, 2012
"floating under the influence"; floating on a tube or raft down a body of water, prefferably a fast moving river, while shitcanned (i.e. wasted or fucked-up on any drugs)
Yesterday, while tubing down the mighty Mississippi, Jimmy got a FUI for being intoxcated while flashing his "down-stairs mixup" to the police; his wasted ass went to jail.
by Justin Ianello February 16, 2008
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