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Definitions by emo4ever

mustard brain 

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the word your mom uses when shes mad at another driver .
Mom: you mustard brain pee knuckle !!!!
mustard brain by emo4ever January 8, 2022
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mustard brain 

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the word your grandma uses when she is mad at someone.
grandma: YOU MUSTARD BRAIN PEE KNUCKLE!!
mustard brain by emo4ever January 8, 2022
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