soul sister

boy or girl; someone of the opposite sex who you have everything in common with from music taste to birth defects. Even if you don't speak to this person frequently, when you do you can become like siblings within the hour.

Girl #1: "We have the same favorite song! Our parents have the same name! We both are allergic to Heinz Ketchup!"
Girl #2 "Why don't you marry him then?"

Girl #1: "I would, but we're already soul sisters!"

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