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A word used to describe a person who is actively attempting to kill/end a conversation, or makes zero effort towards continuing a conversation causing it to die.

Commonly done via text message, on Facebook chat, and, to a lesser extent; during face to face interaction.
Sam: Hey dude!
Jack: Hi
Sam: What's up??
Jack: Nm.

*Jack is convercidal*
by rabrab December 31, 2011