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General slang for a lesbian. It comes from the act of one lesbian 'dunking' ones face into another's 'muff' or vagina.
This is also a term for a guy who eats a lot of pussy.
'Dude, don't... I think she's a muff dunker'

' "Hey I hear Larry's gettin action now!"

"Serious?!"

"Yeah he's a regular muff dunker!"
by Cayk September 20, 2010
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