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1.
A misspelling of OMFG. Means "Oh fucking my god." Related to l33t.
1. OFMG, oh noes! That n00b pwned 73h uber l33t hax0r5!
by Someone random October 19, 2005
 
2.
Oh Fuck My God

As a misspelling for omfg this was used as an excuse for missspelling omfg.
<Tom> OFMG
<Daniel> Oh Fuck My God
by DangerousB April 08, 2006