Oh My Fucking Ass God
Most extreme version of omg, omfg. Currently the MOST extreme.
Note: this word is not actually said, the abbreviation is only used in typing, for example, in a chat room
Hold on... I think I'm getting hacked... OMFAG!! I just lost control of my other computer: it's going berserk!! OMFAG... it's transferring all my confidential files!! SHIT.