1. Noun: The sound created by human shit hitting the water in a toilet. Often as a direct result of how large the log was and how deep the bowl is.
2. Verb: The action that brests perform when a topless female is getting fucked missionary.
1. Man, I had to hang on with both hands to try and and squelch that last kathunk.
2. I felt like I was going to break that bitches nose, you see how those things were kathunking her head?
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