It's a kind of fetish for holding in pee.
"Did you know Luigi is into omo?"
"Oh wow, I could never. I'm not really into that dom and sub relationship you know?"
"Yeah same. I respect Luigi though."
Can also be O,m,O .
Like OwO, it’s supposed to be a letter emoji to describe the face of a smiling cat, but for OmO it means the cat is frowning—conveying emotions of sadness, concern, disappointment, or annoyance.
Furry: You wanna go out for dinner?
Friend of furry: No, sry, I’m in the hospital recovering from a car crash.
Furry: OmO………O,M,O !!!!!!!!!!!!! ARE YOU OKAY, MAN~!!!!
It's used to express how you feel before going further. It's like the first word used
OMO, I'm tiresd of life.
Virtually everything in existence subs in for any word
Boy: He Omo did that? Means: he actually did that? Omo subbed in for actually