Top Definition
UFO
Abbreviation for "Unidentified Flying Object". The USAF defines a UFO as: Anything that relates to any airborne object which by performance, aerodynamic characteristics, or unusual features does not conform to any presently known aircraft or missile type, or which cannot be identified as a familiar object. (USAF Regulation 200-2)
The Mutual UFO Network (MUFON) is the world's largest civilian UFO scientific reseach organization.
by ufologist February 06, 2005

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UFO
Unidentified Flying Object. Has evolved from a simple military classification to a word synonomous with aliens, Roswell, conspiracy theories, and general paranormal nuts.
It's a UFO! Oh, wait, it's an airplane. Or a pie plate. Or a crazy person.
by Disco Stu December 08, 2004

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UFO
unclothed female object
Warning: UFO inside.
by Bubbs20 November 03, 2009

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1.Unidentified flying object. The term is used to when relating to "Alien ships" or "Flying saucers"

2.Can also be used to relate to actual unidentified flying objects such as an enemy aircraft. Although not knowing exactly what it is.

3. Term used by rednecks to define aliens.
1. Hey brandien! Lookie' wats' I foun'ded' Dun here in de' durt'! I dun founded me a yoo ef oh!

2. Mr president. There has been another sighting of a U.F.O Immediete action will take place.
by Refoops December 18, 2005

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The best pants in the world. The are light as a feather, they dry fast if you spill something on them, they don't wrinkle, they are easy to get in any size and are very adjustable, they come in almost every color, they have buttons on the pockets so your stuff doesn't fall out when you sit down, and they're the most comfortable pants ever. They fit snuggly around the waist and the legs are wide without looking like hakama pants (those dress-looking pants that you see martial artists wear sometimes)
I have four pairs of UFO's because they are the candy cigarettes of pants!
(you know, because candy cigarettes are the best candy ever)
by The Yellow Dart2 February 07, 2006

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really fuckin comphy pants
i love to dance in my ufo pants!
by pixie August 18, 2003

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ufo
1. Unidentified Flying Object. Usually refers to an alien spaceship that we don't know anything about it

2. Ugly Fat Old. Usually describes women who are well past their days, and even then they probably weren't very hot. They are usually seen in public in twos or threes and the only thing they do is talk to each other no matter the circumstances.
1. That UFO just crashed down in an open field. We have no idea where they came from.

2. Some UFOs sat in front of me at the movie theater the other day and they wouldn't shut up for the whole entire movie.
by tuesday22 July 05, 2012

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