Popular Kick/Twitch streamer "YourRAGE" popularized this term. Stemming from his expression "OH MY", his stream chat copied his expression and typed it as "O MA". This spelling of the popular expression paved the way for much more nuanced usage of this word. O MA has been used multiple times by streamers and non-streamers alike. Kai Cenat, Agent00, and many others took this expression and therefore their chats adopted this expression. YourRAGE detests this word from becoming mainstream, so not many people know about this word outside of the W/L community on Twitch.
"O MA" can be used in many ways, but mostly used for twists or very surprising events where you would use the word "Oh My!". Due to this very comedic way of saying this common phrase, it is acceptable to even say this in slightly surprising or awe-inspiring events. This would classify it as a "Filler Word" and therefore, slang that can be shaped and molded to whatever the speaker has in mind.
"O MA" can be used in many ways, but mostly used for twists or very surprising events where you would use the word "Oh My!". Due to this very comedic way of saying this common phrase, it is acceptable to even say this in slightly surprising or awe-inspiring events. This would classify it as a "Filler Word" and therefore, slang that can be shaped and molded to whatever the speaker has in mind.
Example 1;
Video: "Competitive art used to be an Olympic sport."
YourRAGE: "O MAAA"
Example 2;
Person 1: Did you see the new 2k game that just came out?
Person 2: Nah, 2k fell off since 2k16.
Person 1: O MA.
Example 3;
Movie: *twist occurs*
Reactor: "O MAAAAAA"
Video: "Competitive art used to be an Olympic sport."
YourRAGE: "O MAAA"
Example 2;
Person 1: Did you see the new 2k game that just came out?
Person 2: Nah, 2k fell off since 2k16.
Person 1: O MA.
Example 3;
Movie: *twist occurs*
Reactor: "O MAAAAAA"
by schoolership March 22, 2024
Get the O MAmug. John - "Bro I just wanna eat somebody's booty out..."
Jeffrey - "Dude, you're a literal freak-o-path. Get help."
Jeffrey - "Dude, you're a literal freak-o-path. Get help."
by Zeruel June 10, 2025
Get the Freak-o-pathmug. by w word October 21, 2023
Get the botol-o-watermug. 
Usually a video game censoring "hell" from "hello" because its censoring system is very oversensitive.
by squidb_ll October 5, 2020
Get the ****omug. What da famous feminine-hairstyle-bashing talk-show host has become due to his racist/slanderous remarks and surly persona.
With all da horrible verbal crimes he committed, I am frankly astonished that Don I(nfa)m(o)us was allowed to remain on da air!
by QuacksO December 26, 2018
Get the Don I(nfa)m(o)usmug. by Evangeline of angels October 20, 2014
Get the O-mazingmug.