"UFO" is short for "you for real" and is used when someone says something that's facts or hella lit. Is often used while bending your arm at a 90 degree angle and waving it forwards and backwards while shouting UFO.

Originated from "You're for real" --> "You fo real" --> "U fo" --> "UFO".
"Harsha's gonna get blacked out tonight"
"UFO UFOOOOO!"
by mike_hunt19 November 1, 2021
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"Are you going to wear your bright yellow UFO's to the rave tonight?"
by Diego September 10, 2003
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A totally fictional,(gulp), spacecraft that I did not see on the 24th May 2007.

I did not report it to the police because I did not see one.

UFO's are not real. I can seriously... and honestly state... that UFO's are fictional.
Jack: Hey, didn't you see a UFO?
Blake: No.
by Blake, yes... Blake March 29, 2009
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Knitting term, stands for UnFinished object. Often used on Knitting Blogs.
"i still have alot of UFO's to work on thiss weekend"
by Othlon December 17, 2006
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UFO stands for unidentified Flying Object.It means it is not a Earth transport.
1.John believe most alieans use UFO to other planet.
2.Not every UFO contain aliean,some contain human being from far far away.
by Sam Koh June 23, 2004
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(Unidentified Floating Object) After a long night of drinking, you wake up to a stomach rumbling. You have no idea what you were drinking and eating after a certain point, but your bathroom session let's you know damn well that it didn't agree very well.
I woke up hungover and my stomach was boiling with UFO's.
by dav!d February 27, 2008
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the process by which a man tucks his penis and genitalia into his ball sack, making it look like an unidentified flying object
Immediately as I walked into the room Zach showed me his newly trimmed UFO.
by The Doc. December 4, 2007
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