much like the original definition, used to describe somebody unfamiliar, not from your neighborhood or circle.
"who's that kid in the hat over there?"
"I don't know, man. he's UFO."
by dano whatever May 21, 2005
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The sexual act in which a man performs on a woman (preferably someone's mother). First all the lights are turned off for total darkness. Next the man slips a glow-in-the-dark condom over his penis and then begins to float around the dark room; thus giving the effect of a flying spaceship, or other un-identified floating object. The woman then is invited to catch such object with whatever she pleases, i.e. her mouth or other orifices. When the man grows weary of floating around, he then proceeds to crash-land his "ship" into the woman's "Area51”.
"Hey Mitch, I totally UFO 'd your mom last night ! "

"She always loves when I crash my UFO in her. "
by Matty58 March 29, 2008
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In reference to the skiing and snowboarding industry, UFO stands for uncoordinated fucking orient. Applies to all the asian, indian etc. punters who cant ski or board worth a damn and will never be able to - why? Because they are a UFO.
That UFO just stacked it for the 50th time!

I hate teaching UFOs. Its a waste of time!!
by miniseaweed July 31, 2009
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science fiction cult tv show with cool vehicles and sound effects (especially the ufos themselves)
by et October 30, 2003
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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 5, 2012
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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 7, 2006
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