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1.
Oh My Absent Fucking God. It's OMG but for Atheists. Technically you could use OMAG to be polite but nobody ever does; Atheists are angry fuckers at the best of times.
What? The rapture has been moved to 2012? OMAFG those Christians are stupid motherfuckers.
by Bill Occam May 26, 2011
 
2.
Oh My Actual Fucking God

An even more dramatic version to the "omfg" acronym.
omafg.. You don't listen to that shit...?
by It's Aj October 21, 2007