2. An accident involving someone shooting his or herself in the leg.
Derived from the name of soon-to-be-former NY Giants wide receiver, Plaxico Burress, and the "accident" of shooting himself in the leg in a night club which simultaneously put him in jail, ended his career, and nullified the rest of his contract.
Billy Bob: Hey, did you hear what happened to your boy Griz?
Sam: Yeah, he was getting head while making a homemade bomb and lost the side of his face. Complete Plaxident.