student asking question

I know there's this exclamation in a song titled "bad buy" by billie eilish. What does it mean?

teacher

Native speaker’s answer

Rebecca

"Duh" is an expression that we use to show we think something is stupid or obvious. Ex: Duh, of course he's a bad boy. He makes girls cry all the time. Ex: Seoul is the capital of South Korea, duh. You seriously didn't know that?

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