The act of having uncomfortable sex with someone who is too intoxicated to proceed but unwilling to drop it all together, leading to several useless and occasionally painful pelvic thrusts.
Toniann did not enjoy her first sexual experience with her brand new lover due to being cunch punted for an hour before he gave up.
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.