1 definition by Cicinotouch
Two people involved in a romantic or sexual relationship. They aren't blood related, but are so close in kinship or friendship that they might as well be. This could include step-family, family friends, god-siblings, etc.
Person 1: "Andy, just get with Sandy already. What are you waiting for?
Person 2: Ew, man! We've known each other since the first grade. That's like kincest.
Person 2: Ew, man! We've known each other since the first grade. That's like kincest.
by Cicinotouch December 22, 2013