someone who is very stupid, often used as a joke
cassie you have bricks for brains
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A player who has had his brain fremented from playing too much Protoss in the video game StarCraft II Multiplayer Edition.
Guy 1: I can't believe you lost your reaper like that
Guy 2: Yeah, I think I've grown a brick brain after playing too much protoss
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A brick brain is a person named Jackson who had a brick placed on his head by a Karen.
Karen: BRICK BRAIN!!!
Jackson: *contemplates life choices*