score on yourself 

1.To score a point against your own team in a sport; to shoot into your own goal.
2. To give yourself a disadvantage in a game.

I just scored on myself to lose the game.

score on yourself by 5'1"Racer June 12, 2005

score on yourself 

To disadvantage yourself.
Taken from when you accidentally score against your own team in sports, but can be used in a general sense.

A: I just lost my wallet
B: way to score on yourself
etc.

score on yourself by assfacemcgee December 28, 2005