When siblings share physical similarities. Similar to the word "lookalike" but specifically used to describe siblings.
"Very similar face, I can see the siblingness"
by aceofaces January 21, 2009
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When someone you are interested in goes one step beyond friend zoning you and tells you that you are like a sibling to them. Also see "sibling zone". Being siblinged is permanent.
Guy: What happened last night as your dinner with Andrew?

Girl: We were having such a great time, laughing and sharing all these things we have in common. But then I got siblinged.

Guy: What do you mean?
Girl: He literally said to me "We've got so much in common, you are basically a sister to me" - So, thats one step past the friend zone.

Guy: Oh that sounds like Andrew...
by hauntedhouse90210 December 7, 2014
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