(fuh-fug-ly)
Ffugly = Fucking fugly = fucking FUCKING ugly... this is quite possibly the most hideous anyone could ever get. the act of being double fucking is the equivalent of a chuck norris roundhouse kick. thus making Ffugly the term for the most ugly of uglies...
friend 1: "dude that chick from last night was soooooo into me. why did you have to cock block me?"
friend 2: "dude you were drunk and didn't realize she was Ffugly. i saved you from the embarrassment."