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1.
phrase. In My Fucking Opinion.

A slang derivative of IMO, usually used with anger.
Guy 1: Computer games are for fags.
Guy 2: You need to shut the fuck up, IMFO
by Shifty Eyed Goat July 15, 2004
 
2.
Also IMFO or imfo, could stand for either "I'm fucking original" (usually used in a sarcastic or mocking fashion) or "In My Fucking Opinion" (usually tacked on at the end of a sentence).
Fag: Check out my Sonic recolor.
Queer: Oh, ImFO.

Nancy Pelosi: We need to work toward the goal of equalizing income in our country and at the same time limiting the amount the rich can invest.
Thinking Man: We need to work toward shutting you fucking mouth, IMFO.
by Fuck Shit Piss February 27, 2008
 
3.
Also IMFO or imfo, could stand for either "I'm fucking original" (usually used in a sarcastic or mocking fashion) or "In My Fucking Opinion" (usually tacked on at the end of a sentence).
Fag: Check out my Sonic recolor.
Queer: Oh, ImFO.

Nancy Pelosi: We need to work toward the goal of equalizing income in our country and at the same time limiting the amount the rich can invest.
Thinking Man: We need to work toward shutting you fucking mouth, IMFO.
by Fuck Shit Piss February 27, 2008