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Describing the feeling of being pouty or upset. Stems from the sound one makes when pouting one's lips.
Can be used as an adjective or verb.
I failed my test today; it makes me so duu.

Duu! I can't watch the movie with you guys tonight!
Duu by chenxjen July 27, 2010
Related Words
The DUU is a group of three or more girls who are only mates because their boyfriends are mates. They're usually quite wet girls and they are embarrassed to expose the real meaning of the acronym. (Dicks Upset Us). This group, is therefore only for homosexuals.
I'm in the DUU because I'm wet
DUU by garnettknows May 9, 2017

duu duu cat 

An individual who is confused and tries to fit in by attempting to do too much when unnecessary,
Ghost Ryder - Yo Tygrr this DJ sucks!!!
Tygrr - Shunnnn this DJ is a DUU DUU CAT!!!
duu duu cat by King Tygrr May 17, 2011
Oh worddd, Tom Meade mah duu.
Mah Duu by Tom Meade October 20, 2008
Abbr. of "sup dude" only commonly used by the very coolest of people.
Dude 1: Sup dude?
Dude 2: Su du?
Dude 1: Suu duu?
Dude 2: Suuu duuuu??
Dude 1: Starcraft?
suu duu by nighteeeeey June 30, 2019

Fake duu 

Somebody who is unloyal to their friends and goes out of their way to stab someone in the back.. refuses to "Roll Deep" with their crew.
Fake duu by True Duu July 14, 2006