Top Definition
When someone randomly comments on one of your facebook posts, making everyone else not want to.
Usually a relative or a lesser-liked friend of yours, or someone that you don't like that is a friend of yours on facebook.
John Doe is gonna go 2 da baseball game!!
Grandma Doe - Hey sweety!! How are you? Say hi to your mother for me!

John (mentally): Oh god, Grandma just performed comment murder!
by lochei May 14, 2010

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