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1.
A term from paintball. To intentionally or unintentionally repeatedly shoot an opponent after he has been eliminated. Different from bonus ball.
I did not mean to overshoot him, by the time the first ball hit four more were coming behind it.
by Paintball.Charon July 28, 2005
 
2.
1. To shoot a target excessively more than one time.
2. When a cop shoot the guy more than once in the movies even after the bad guy is dead.
"Damn he over shot the poor bastard!"

"Don't over shoot it!"
by Angriest June 30, 2013