Most likley derived from the term OMG by those who chose being offensive to the extremley religous more important than saving themselves the painstaking work of typing 2 extra letters or keeping the versatility of the term OMG (by narrowing it down to simply "Oh my god" instead of "Oh my gosh", "Oh my goodness", etc. )
"OMGod u suk at dis game n00b!"
von what are you an internet stalker? 18. Dezember 2005