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an acronym;

Produce When It Counts

To perform well or to the fullest extent of one's ability in a clutch situation.

To exceed another's expecation of your ability in an important situation or moment.
Dude, you totally PWIC'ed back there when you got those free tickets to the game.

You PWIC'ed that last 100m when you out-kicked that guy.
by Ryan Vanhoy September 09, 2011