O.F.F.

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.