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)

Unidentified Flying Object. Has evolved from a simple military classification to a word synonomous with aliens, Roswell, conspiracy theories, and general paranormal nuts.

unclothed female object

UFO stands for unidentified flyung object or use of what people say aliens fly in.

Unequivocally Fucked Over. Being so incredibly screwed that nothing will even compare to how screwed you are.

UFO is an abbreviation for Ugly Fucking Oriental.

Unidentified Fucking Object, which means a designer dildo