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Coming from Spanish translating literally to "one more." Common when drinking or during drinking games.

Popularized by the movie shanghai noon when the two main characters get drunk and convince each other to go another round asking "Uno mas?"
Drunk 1: I should stop now...
Drunk 2: Come on! Uno Mas?
Uno mas by $$$Danny$$$ January 18, 2009
It is a popular sport where the object of the game is to get a ball into a bin without using your hands or letting it touch the ground. You must say Uno Mas and score before you leave the game.
"Did the Uno Mas club play in the mini gym after school today?"
Uno Mas by Shs_unomas October 23, 2019
A Really Cool Guy. An Uno Mas Will Aways Cheer You Up With Funny Jokes.
Person 1: Hey, Marcus Helped Me With My Homework And I Got An A+
Person 2: Yeah, Marcus Must Be An Uno Mas
Uno Mas by UrbanEel November 11, 2016
A Loyal And Faithful Person Who Is Trustworthy And Cool And Funny At The Same Time.
Person 1: Hey Marcus Helped Me With My Math Homework And I Got An A+
Person 2: Yeah, Marcus Must Be An Uno Mas
Uno Mas by UrbanEel November 11, 2016

<.7.9.7.6.>Falta Uno Mas, faLta uNo mAs, faltA unO maS<.7.9.7.6.> 

<.7.9.7.6.>Falta Uno Mas, faLta uNo mAs, faltA unO maS<.7.9.7.6.>
<.7.9.7.6.>Falta Uno Mas, faLta uNo mAs, faltA unO maS<.7.9.7.6.>

UNO massacre 

getting absoultly embaressed in the game of uno.
did you hear about kballs getting destroyed in Uno" yah it was an Uno massacre
UNO massacre by WolfpackSAW May 16, 2011