Big-brain, (Which can also be spelled without a hyphen,) means smart, intelligent, and is usually used when someone says something witty in an argument.
Maddie is really big-brain for saying that!
Or
Maddie is really bigbrain for saying that!
by ~Chrysanthemum~ December 2, 2020
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A big brain is a person who is stupid and yet smart with their stupidity.
Look! Jeff just pulled a big brain by jumping out of a three-story window to beat his sister down the stairs.
by Big Brain Joe May 21, 2021
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something u or someone did caught your attention and u thought it was very smart.
YO that microwave cookie was such a BIG BRAIN Idea
by Brcvpa February 22, 2021
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A big brain is a brain that only big brains can handle.

Only a few people have big brains, therefore they're genius.
Person1: 2+2=7
Person2:BIG BRAIN
by shoulder pain sufferer October 26, 2019
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Jules: You know what they call a Quarter Pounder with cheese in France?
Brett : No.
Jules : A Royale with cheese! You know why they call it that?
Brett : Because of the metric system?
Jules : Check out the big brain on Brett! You're a smart motherfucker. That's right. The metric system.
by dlicen August 10, 2022
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Jules: You know what they call a Quarter Pounder with cheese in France?
Brett : No.
Jules : A Royale with cheese! You know why they call it that?
Brett : Because of the metric system?
Jules : Check out the big brain on Brett! You're a smart motherfucker. That's right. The metric system.
by dlicen August 10, 2022
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Big brain is a term for the opposite of a genius.
by cdmkv March 18, 2021
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