Top Definition
To push the entirety of your nose into the anus of another person.

An extreme form of brown nosing.
Matt: "Mfffmfmmffmm"
Dave: "What?"
Matt: "Mfffmmmffmm"
Dave: "You know its rude to talk and knurk at the same time"
by KnurkHerder January 11, 2013
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