masturbating in a semi-public location
she got him so horny that he was playing uno in the alley
A question you ask to someone if they want to play uno
Hey (Insert name here) Wanna Play Uno?
A day where Mr. Mattern played uno
June 2 national Mr. Mattern plays uno day. is a day where Mr. Mattern played uno
When you are trying to be secretive about sleeping with someone you use a code word that you played Uno with this individual.
Conner: Man, we didn't do anything last night. We just played uno. It was very lowkey.