Unidentified Puntable Object
Puntable meaning kickable obviously.
Small dog, soccer ball, any thing puntable.

"God that little yappy UPO was getting annoying"
door bdagz 24 februari 2010
usless piece of shit
that twat is such a upos
door reens 2 augustus 2005
Unidentified Phallic Object. A flying saucer with a penis.
The UPOs penis was flapping against it's underside as it zoomed across rural America.
door Jstat 9 oktober 2008
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.
door Shiloanne 16 oktober 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
door MISTER OWNINATOR 22 augustus 2011

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