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when something (usually an idea or a piece of art) hits you like a truck and you can't stop thinking about it
That new song? It ate my brain. I'm stuck in my head like a cockroach in a jar.
I saw that painting and now I can't stop thinking about it. It's like my brain got kidnapped.
That movie? It ate my brain. Now I can't think about anything else. My thoughts are all scrambled.