When a member of the opposite sex (or same sex) declares you to be "brother/sister", thereby ruining all potential chances of sex.
Guy: Would you like to go out with me?
Girl: I'm sorry, but you're like a brother to me.
Sibling-zoned!
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Pretty much the Brother Zone and Sister Zone mashed into one convienient term.
Jen told me she liked me like a brother. How the fuck do you get out of the Sibling Zone?
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