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Unidentified Foreign Object. A foreign "object" to a body that has violated the body via penetration.
My girlfriend felt a a UFO last night, and I don't think it was me.
UFO by Dymeadozen8866 May 5, 2006
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."
UFO by dano whatever May 22, 2005
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. "
UFO by Matty58 March 28, 2008
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!!
UFO by miniseaweed July 31, 2009
science fiction cult tv show with cool vehicles and sound effects (especially the ufos themselves)
let's go watch ufo!
UFO by et October 30, 2003