"What does that have to do with the price of tea in China?" is an expression which denotes that what the other person just said is completely unrelated to the original topic.
Person A: President Bush is the best president EVER!
Person B: No, he's not! He's the worst president!
Person A: Why do you say that?
Person B: Umm, I just bought a guitar.
Person A: Well, what does that have to do with the price of tea in China?
Is a phrase used in a few situations, most common is when you are seeing a girl and her best friend likes your friend and so she wants to double date, and the only way you are going to get with your girl is if your friend comes along to the date, but it usually turns out that her best friend is fat or sum ugly bitch that noone would fuck. Fat bitches usually fuck things up so your friend decides to come along anyway so you can take your girl sumwhere else and bang her.
Fred: Hey John Sarah's friend Mel wants to go on a double date with you.
John: Fuck man Mel is one fat bitch she'll rape me...but ill do it for the team
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