UWU is to indicate that your eyes are closed in a "cute" way (but for people with 2iq or over, its extremely cringey
It is also very similar to the word OWO (also cringe)
Person 1: im a furry UWU
Person 2 (>2iq): wtf shut the fuck up
UwU is the short method of asking/demanding someone to Urinate on you standing for “U wanna Urinate?” Often found in fetish communities, the word is often used in a very direct manner and can be used as a command as in “U wanna Urinate on this” like a dog marking it’s territory.
This term stems from the Hentai anime realm of anime and is shown as an facial expression during the act of Golden Shower scenes by the Character.
Person 1: I wanna go even further with you! UwU?
Person 2: I’ve always wanted too!
Person 2: commencing.
Person 1: (Facial expression (UwU))