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A faan is a total cockroach of a person. It’s like the worst kind of annoying bug that never leaves. You use it when someone is giving you the worst kind of headache or when you want to call someone a brain-dead donkey.
My neighbor is a faan. He sings at 3 AM.
You're a faan, and I'm leaving.
That kid in class is a faan. He talks too much.