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Meaning Oh my god but the a is added to flow better when you are talking.
by Coey Oliver March 01, 2008
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Stands for 'Oh my giddy aunt'.

Which is a euphemism for 'Oh my God'.

So OMGA is a euphemism for OMG.
Text from your mother: your brother just broke his arm

Text reply: OMGA
by WouldMeister April 28, 2017
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