Definitions by Onomitoe

Mopper 

A person playing an FPS (First Player Shooter) and finishes off your opponent after you had killed him more than half way.

(Me)Dude! That mother fucker keeps mopping my Kills!
(Hassinator) Yeah bro his killing blows are through the roof!
(Me) I know, i hate a Mopper.

Mopper by Onomitoe January 12, 2010