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1.
to steal defeat from the jaws of victory. to loose after a certain win. to knepp up.
the oilers really knepped up against the bills in that playoff game in 1993
by RayRayBoom-I-Yay April 12, 2007
 
2.
to fuck up a victory right before the end of a certain win.
to knepp up
John's team was up by 6 with three seconds left, then he knepped up by throwing an interception that was ran back for a touchdown.
by RayRayBoom-I-Yay April 11, 2007