An O.F.F. or an off is an "overly flirtatious friend." Usually, this would coincide with people known to be players, or just straight up unaware that they're affecting you in such a way. They may result in heartbreak, emotional distress, happiness if you're looking for that special attention, and cringe-worthy pick-up lines.
Be careful about having feelings for Bob. I heard he's been an O.F.F.
"Good Old Fashioned Fun"
doing childish things like playing at a park or going to a movie or just sitting outside. Usually done while under the influence of marijuana or alcohol.
Marsh: Hey man, wanna have some G.O.F.F. today?
Lonnie: Yeah dude, we should have some G.O.F.F. at the park by playing some whiffle ball.
International Federation Of Father Fuckers.
See Fatherfucker
People into Rap/Hip Hop seem to get really annoyed when someone says Fatherfucker. Not any more offensive than the term Motherfucker
Are the Mother Fuckers ready for the Father Fuckers - a line from the Album "FatherFucker" by Peaches.