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1.
little bitches in halo 2 who come and kill you or a team mate after and intense firefight. Your shield is usually completely down and one shot with an SMG and you are dead. Many pussys rack up kills this way, because it requires no talent
HankTizzy had so many clean up kills i wanted to give hime a cleveland steamer
by anusol September 19, 2005
 
2.
A Cleanup Kill is when, while playing a FPS (first person shooter) game online, such as call of duty: modern warfare 2 you run into multiple enemies trying to kill each other. You let them die as best you can, then "cleanup kill" the rest.
"Dude i just cleanup killed those bitches so good"
by MXXXG January 01, 2010