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Siblings that think and act alike. The term is reserved only for the cases when siblings seem to have a consistent psychic link like the one attributed to twins.
"-Those two got one another the same Shot Glass Snakes 'N' Ladders game for Christmas."

-Their twiblingery frightens me on a primal level."
by lycann March 30, 2009
Siblings (brothers or sisters) close enough to almost be twins.
My sister Emily is so close to me that we feel more like twiblings.
by rperazag January 02, 2011