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an offensive phrase use similarly to the phrases "Asshole" "Douche Bag" and "Fucker". It can be applied to many situations. This could also be a reference to the object used to cover up a vagina for some one reason or another.
"That dude just knocked my phone out of my hand, what a cuntmuff!"

"Did you hear about the girl in 211? She had to use a cuntmuff because she was dripping on her floor."
by John Jumnighn January 18, 2017
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