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."
by DelicateYui July 10, 2019
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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~!!!!
by luigimario1997 May 7, 2022
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person 1: omo is a cute robot
person 2: that is true
by loopyfart August 13, 2021
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It's used to express how you feel before going further. It's like the first word used
OMO, I'm tiresd of life.
by Dence bill July 29, 2022
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Virtually everything in existence subs in for any word
Boy: He Omo did that? Means: he actually did that? Omo subbed in for actually
by Omo cuz D3B December 31, 2021
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