Unidentified Phallic Object. A flying saucer with a penis.
The UPOs penis was flapping against it's underside as it zoomed across rural America.
ayon kay Jstat ika-09 ng Oktubre, 2008
usless piece of shit
that twat is such a upos
ayon kay reens ika-02 ng Agosto, 2005
Unidentified Puntable Object
Puntable meaning kickable obviously.
Small dog, soccer ball, any thing puntable.

"God that little yappy UPO was getting annoying"
ayon kay bdagz ika-24 ng Pebrero, 2010
Another way to say "your mouth", so if you accidentally type "Shut upo" in an online arguement, the person can't call you stupid.
justasaurus says:
shut upo?
síi says:
yes
justasaurus says:
way to type loooooooser
síi says:
upo means 'your mouth', obviously.
ayon kay Shiloanne ika-16 ng Oktubre, 2007
Unidentified Photoshopped Object

A supposed picture of a flying saucer or extraterrestrial spacecraft which is an obvious fake created via image editing
UFO pictures these days are almost always one of two types:

- A blurry dot that could be anything
- A UPO
ayon kay MISTER OWNINATOR ika-22 ng Agosto, 2011

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