Top Definition
the unspoken sympatico shared by twins - most especially those moments where they appear to have an almost telephathic understanding of each other.
(playing charades)
twin 1: film, book - five words...
twin 2: (cuts in) the unbearable lightness of being.
other players: foul! twinstinct!
(as overheard on a recent rail journey)
by hierophant January 08, 2006
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