1. An all-around duesch bag that thinks they're tough, but in actuality can easily be knocked on their ass with one punch.
2. The act of knocking out a duesch bag with an uppercut, causing them to flip in the air like a pancake, or "flap jack."
1. "All British fighters are fuckin flap jacks!"
1. "O.K. That's it! That Duesch bag is getting Flap Jacked!"
2. "Did you see the Bisping Henderson fight??? Bisping totally got Flap Jacked!!"