Chin Strapper
Someone who fails epically at a simple task, or is just a complete douche bag. Derived from football players that fling their chin strap off after an epic fail.
Joe: HAHAHA! Jeremy, Did you see Bob try to but that hottie at the bar a martini then spill it all over her...
Jeremy: That's because Bob's a F'n chin strapper.
Jeremy: That's because Bob's a F'n chin strapper.