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Used in MSN conversations, when you see/read/whatever something that is really hot/cute/sweet/nice etc.
MSNer 1: Hey! Check out this superhawt RyRo picture (:

MSNer 2: OMGAH! He's so cute!
by Jedi Master Luna August 14, 2006
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Sep 16 Word of the Day
(noun) A successful type of theft which results in an acceptable, impressive and rewarding payday for the protagonist.
Last night, hit a good lick. I brought home three figures easy for about two hours worth of my time. Not too bad I don't think.
by Nikki Stixx January 18, 2021
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2
an exultation expressing extreme excitement or surprise in a particularly pleasing situation; can also be used to replace the phrase "holy shit!"
Thing 1: Have you seen "The Shawshank Redemption"?

Thing 2: "OMGAH! I LOOOOVE that movie!"
by Youwishi'dtellyou June 18, 2008
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