A misspelling of "awesome" made by user orch10, and a user submission to YouTube video series "Your Grammar Sucks".
Pronunciation made by Jack Douglass -- hence the only correct one -- is "OWMMMMM".

First usage spotted in JacksFilms' Your Grammar Sucks #18.
"YES OH MY GOD! I cleared this game!"
"Wow, that is totally awome, man."
by cutesy pastel living doll April 22, 2013
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