When someone is a fucking idiot they are a small brain.
Mike "Yo I charged off the map trying to get the transing zen."

Jane "LMAOOOO you are so small brained nerd lol."
by SMall BRained February 21, 2019
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Someone who is dumb as fuck and has no culture. This person has almost always never gotten laid and eats apple seeds everyday.
Small Brain Human: How do apple seeds go up the tree?
Big Brain Humans:🤦🏼 ♀️
by *rebuilds dick* December 11, 2019
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When people have a small brain, they are not smart. In comparison, their brain is at least 2 times smaller, but in rare cases can be even smaller. Small brains usually: are brown haired, play volleyball, have a twin, named Madison.
Who’s that?
Oh that’s Madison, she’s a small brain.

Aw, poor thing.
by NotEllieTalbot November 16, 2019
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You.
Did you seriously mess up the cobblestone generator again? You're such a small brain.
by [insert clever name here] February 19, 2020
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"Small Brain" is an insult that implies that the person it's being attributed to has a small brain
That was small brain move, Ryan.
by Limess January 2, 2020
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when ur dumb
i had a small brain when i did a test
by shit words September 10, 2020
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