Top Definition
Someone, usually a marsupial, who enjoys ramming their hands up other people's asses, all the way to the knuckles. This will of course cover the assailants hand in muck, leading to the obvious name
Bryan Jones doesn't care how old or what sex you are, he will jam you up the pooper hard, he is known as THE Muck Knuckler.
by BetterThanYou717 June 07, 2010

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