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A specific part of the female anatomy that is unclean ie. A dirty vagina. Also a name given to describe females that are often regarded as promiscuous.

Although it should be noted that this term is not always necessarily used in a derogatory or degrading way. As a wallet is often very handy and even a necessity for many men, so too is a mud wallet!
adj. "she had a mud wallet"
noun. "I really needed to break the drought so last night i hooked up with a real mud wallet"
by Steve Sax January 07, 2008
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