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Examples
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Compared to other intelligence-based insults like “idiot” or “moron,” “smooth brain” has a certain je ne sais quoi. It’s more specific, more visual, and let’s face it, it just sounds funnier.
Smooth Brain Insult: Exploring the Slang and Its Impact NeuroLaunch editorial team 2024
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Smooth brain means you’re dumb wrinkly brain means you’re smart.
My friend called me "smooth brain" when I was trying to explain my adhd to her and I don't know how to feel about it. hardcoregore 2024
 
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