What does that have to do with the price of tea in China? is an expression that indicates that a previous comment is irrelevant or unimportant.

For example, I think we should change the schedule. What does that have to do with the price of tea in China? We’re not talking about schedule. Where did that come from?

“Maybe it’s time to buy more products.” “Excuse me, what does that have to do with the price of tea in China? Who’s talking about products?”

Variations: What does that have to do with the price of eggs?

Tradução: O que isto tem a ver com o assunto? O que isto tem a ver com o que estamos falando?