1. A term often used in video games such as Call of Duty when you are destroying your enemy.
2. Mercin is often used when you kill someone in a ninja like way on Xbox 360 or PS3 online.
3. Can be used as a verb when you are on a killign spree
I am straight mercin you.
by purdueguy November 18, 2008
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In Call Of Duty 4 Modern Warfare, when you kill enemy players online on PS3 or Xbox 360
After a long day of work I came home and started mercin on niggaz until I pasted out
by izderaa71 May 4, 2010
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