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You yell this when you're clueless and you're too lazy to look it up. It's like throwing a tantrum for the whole class to see.
"I don't know I'm Thuli!" he screamed when the teacher asked what caused the American Revolution.
"I don't know I'm Thuli!" she said when she failed the math quiz.
"I don't know I'm Thuli!" he yelled when he didn't know the difference between a simile and a metaphor.