An activity or phenomena that many young males go out of their way to achieve in order to obtain emotional equilibrium and relieve either boredom or sadness. It is often achieved through the use of video games such as "Call of Duty" since the physical act of killing someone or something is often frowned upon. The act of "killing some shit" may also be used therapeutically.
He just got dumped, he must feel terrible. He should go and kill some shit that will make him feel better.
by donotdoit October 27, 2010
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During sexual penetration with a woman (any position, often from the back) her punany is getting the good even stroke.
Aye bro, you hit that ?”

“Ya nigga, I was killing her shit!”
by yourmuva September 29, 2018
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A word used to assist the deflation of one's ego.
Timmy: Benny.. I really want to tap Poogie's ass.

Benny: That's wrong.

Poogie: UHM FUCK OUTTA HERE YOU'RE NOT TAPPING ANYTHING!
Benny: Damn, Bro. She killed your shit.
by the unknown astronomer September 2, 2010
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