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Aussies yell this when they agree with you, like you're the only smart person in the room. It's like giving you a gold star, but you're still the weird kid who brought a calculator to recess.
"I'll pay that," he said, like I just solved the Riemann Hypothesis.
She yelled, "I'll pay that!" after I explained how to tie a shoe.
He said, "I'll pay that," because I finally got the joke about the chicken and the egg.