to accidentally and unnecessarily harm yourself through pure stupidity. For example, bringing a loaded, unregistered, illegal handgun to a public place and shooting yourself with it. From Plaxico Burress, NY Giants wide receiver.
as a noun:
"I pulled a real plaxico by trading DeAngelo Williams. Now I have no RB's!"
as a verb:
"Why did I plaxico myself by planning on starting twoClevelandClowns in the fantasy playoffs?!?"
verb meaning to suffer an unexpected explosion in one's trousers, especially at a club.
"That post-punk straightedge bi Jewish-Korean-Russian aerobics instructor over there is totally making me plaxico."; "My career plan is to get promoted after plaxicating my boss."