an expression of utmost surprise, confusion, frustration, amazement, terror, or delight; often abrieviated as OMF, it is far more powerful than OMG; made famous by George Clooney in the film BURN AFTER READING.
Guy 1- "I just watched APOCALYPSE NOW."
Guy 2- "Oh sweet, dude! What did you think?"
Guy 1- "Oh my fuck!"