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Ugly Fucking Ogre, no definition needed
Dude 1: U.F.O. spotted
Dude 2: What a sight!
U.F.O. by salamip February 8, 2010

U.F.O. day 

The one day during the menstrual cycle when you are in such pain that when you stand up, it actually feels like the uterus is falling out.
No, I can't go to aerobics tonight......I'm having a total U.F.O. day!
U.F.O. day by fsara April 9, 2004
It's an acronym for You Fuck Old Bags.
It works in most situations. Especially with friends making jokes.
1: Um I don't like him I heard he U.F.O.B.
2: Omg he did!!
U.F.O.B. by TBarbz June 8, 2011

P.U.F.O. 

Noun: A possible unidentified flying object.
Did you see that light in the sky? That was a P.U.F.O.!
P.U.F.O. by Hartz July 21, 2009

U.U.F.O. 

Album by Camellia and another version of the Unknown Flying Object (aka. UFO) that's more advanced, greater version with better technology, probably better than the invention of the Paradise Ship from Kirby's Return To Dreamland, or the Haltmann Company's UFO in Kirby Planet Robobot, used to take over all of Planet Popstar.

The U.U.F.O is known as the "Mystery Circle Ultra" or "Ultra Unknown Flying Object", according to the 1st album song by Camellia with the name “Mystery Circle Ultra / U.U.F.O”.

As mentioned before, it is predicted to be a more advanced version of the average UFO, explaining the name UUFO.

(DEFINITION IS FOR THE ACTUAL OBJECT THAT HAS YET TO EXIST OR BE PROVEN TO EXIST)
guy: yo you ever heard of the U.U.F.O.

guy2 : the what

guy: the ultra unknown flying object

guy2 : yo i saw something similar to that right now above our house!

guy: wait what tHE FUCK-
U.U.F.O. by yurusitaka February 14, 2022

F.O.F.U. 

F.O.F.U is a acronym

Fear Of Fuckin Up
PERSON 1: Man , Ive been working hard on these goals for years now. That pressure sometimes really be giving me that F.O.F.U.

PERSON 2: Bro , kill that noise, you got this, you've had this. Doubt will set you back if you let it grow.

PERSON 1: * HITS WEED * Your right , thanks I needed to hear that today

PERSON 2: I'm not a actual person , just the weed talking

PERSON 1: Shiiiit, well, fixed my F.O.F.U. so I'm gonna keep talking to this mirror
F.O.F.U. by MultiVerseAll February 8, 2019