UwU, an emoticon, also an alternate version of OwO.
UwU is more often used when something is cute, while OwO is more sexual. This term can also be used by members of the furry community. Although, most people who use it are being satire.
Hey, you're kinda cute no homo UwU
Catgirls of the world, unite! You have nothing to lose but your collars
You want to be killed or your a furry.
Girl: UwU
MAN: what the fu
Girl: stop you sussy baka
Man: *graves shotgun*