A Dimnut is someone who can either be stupid or someone who doesn't listen.
Dimnut can also be used as a derogatory term, replacing words like Cunt
Omg you're such a dimnut, don't you ever listen?
A crazy person who is also not very bright
This dimnut thought she could pay her bar tab with a Bass Pro gift card.
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An unintelligent child, that has the brain the size of a peanut or small
Dude look at the size of his head, it huge, but he a dimnut.
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