To completely screw something up by yourself with no intervention/complications by any one else.
Santonio Holmes injured his foot in the open field with no one around, fell to the ground and threw the football up in the air with out being touched so it was a fumble. Play resulted in a fumble recovery and return for a touchdown by the defense. Happened on the Jets/49ers game on 9/30/2012.
Dude... quit holmsing-it every time you go ask her out.