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OMA is essentially the Pokemon equivalent of OMG, using "Oh My Arceus" instead, considering Arceus is the God of Pokemon.
Oma, I'm in love with the new Black/White starters
by Flintrosexual August 19, 2010
Like Oh My God but for Muslims: oh my Allah!
Hey, did you see the new wheels Mohammad just bought?

Yeah, Fatima was all like 'OMA! That's amazing!'
by ScotchandDietinDXB April 17, 2013
3/5 of the word omaha. Largest city in Nebraska; located in eastern Nebraska on the Missouri river
I'm from Omaha.
by Kryten 2x4b May 05, 2003
A gorgeous girl with a really good heart.
That girl is so amazing... she must be Oma
by bluedo March 06, 2012
O.M.A stands for "Oh, my Athiest!" Like 'OMG' but for an Athiest to say.
Say "Oh, my Athiest" when someone says something rediculous, or crazy

-Person 1 - "O.M.A, I just got a dub sack from this stranger I met behind that building outside of Chicago next to my grandmas house.

-Person 2 - "Right on bro!"
by Azhale March 17, 2011
Oh my ana, a common phrase among the anoerxic community on the net. ana=god
"OMA, please forgive me for eating 500 calories more than i should have eaten".
by Anaslover October 10, 2010
Oh my Alkamari, The legendary god of the rangers. Swear word. Ranger alternative to omg
And i was totally like OMA
by The super Red Power Ranger March 31, 2010