“UWU” has no abbreviated meaning, rather it’s a smiling face.
What does UWU mean?
Abbreviation “UWU” doesn’t actually mean anything other than a “smiling face.” If you look at it like this: UwU it’s far easier to see the smiling face with the “w” being the nose and “U” being the eyes that are in smiling position.
This abbreviation is considered safe and appropriate for work. And considered safe for children.