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A derogatory expression referring to someone of Belgian or Dutch descent.
I liked Amsterdam but some of those butter mouths pissed me off with their attitude.
by Eddyde March 22, 2008
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Any woman that a man has sexual relations with and doesn't put his penis anywhere but her mouth.
You remember that blonde chick at the party? I totally took her into that spare room and made a buttermouth out of her.
by Wigglesticks February 06, 2018
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