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)
On this page, you will find 30 slang terms related to UFO. Some of the top words include: X, nub, stealth bomber, whatchamacallit, Snostrebor, and 25 more.