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2.
Used in messaging or email to communicate surprise or exasperation beyond that which would warrant a simple "OMG". Abbreviation of "Oh My God, Meredith!", an exclamation used (frequently) by contestant Gretchen on Season 7 of The Amazing Race. The "Meredith" named in the phrase is Gretchen's husband and race partner ... Meredith.
OMGM! We don't have any milk, so I had to have water on my corn flakes AGAIN!
by WurstEver October 25, 2008
 
1.
Stands for Oh My George Michael.
OMGM! We got the house!
by Firefly13 August 05, 2011