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When the person your talking to is making you too mad to think so after say your closing line you deliver a powerful punch to the cunt and walk away.
The term also has roots from the term punch line due to the fact that they both end conversations on high notes for the speaker.
Bryan: Do we shower after PE?

Jacob: I don't know, we'll see.

Chris: Huh, Jacob, I hope my size doesn't affect our friendship.

Jacob: No dude, I won't laugh at you.

*Chris loses douchebag grin and just before he tries to say some gay remark Jacob delivers a devistating blow to the cunt hence the term cunch line*
by 724983 September 07, 2009
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