The predecessor to "What's this...?"

The mating calls of horny lolis or weebs.

Usually an expression used by...furries..when they find something arousingly intresting.

Cousin of UwU

a face furries use, Or a way to make a face you can use for your art example the O’s are like eyes and the w is to make it cute like -w-, Looks like a cat.

OwO is a meme emoticon popular among roleplayers and furries. It is also well-known from popular copypastas where the writers use baby language to say some rather inappropriate stuff. It is therefore commonly used to troll, parody furries and generally creep people out and is popularly used by teenagers and young adults on social media websites such as reddit and 4chan. It's also on the app "Amino."
If you have trouble reading OwO try to imagine that the “O”s are big and round eyes while the “w” is an upturned, excited mouth. You can also put a ‘face’ around OwO like this: (O w O).
UwU is a variation.