ffo

Slang: "Far Fucking Out" or "far freaking out" depending on your audience. It means the same thing as "cool" or 'tight". It is used to express appreciation for something and can/usually is substituted for the word "cool".

"Dude, I just found out that I won concert tickets on the radio"
"Far fuckin' out!"

-via text messaging-

"aye, how was that party last night?"
"ffo man.... i'm so hungover!"

70's slang, far out, cool