necroflatulence 

Gas so horribly rancid it could animate the dead.

Steve's necroflatulence cleared not only the room, but also the graveyard next door.

necroflatulence by Static Shadow April 14, 2009

Neuroflatulence 

A sudden (and often expected) demonstration of complete ineptitude by an athlete at a critical moment in a game.

Brett Favre has chronic Neuroflatulence, which causes him to throw interceptions at the most critical moments in a game.

This was most recently demonstrated when he threw an interception in the closing seconds of the the 2010 NFC Championship against New Orleans. This prevented Minnesota from kicking a potential game winning field goal.

Neuroflatulence by HOMEYSIMPSON January 25, 2010