Top definition
When you like a member of the opposite sex. Eventually wanting to be in a relationship with them, but they shut you down with the "I love you like a brother/sister"
Brother/Sister Zone:

Guy: Derpina, will you go out with me?
Girl: Derp, I'm sorry, but I love you like a brother that I've never had, and I don't want to ruin that!
by tinkerbelleh_01245 June 12, 2012
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