Top Definition
defines the relationship in which you and someone you know have slept with the same person. kind of a variant on the transitive property of sexual multiplication.

a < -- sex -- > b
b <-- sex -- > c
a < -- unkatunk --> c

orig. Risley Hall, Cornell University
"I heard Christopher Reeve was such a wh0r3 when he was at Cornell, practically all of Risley was unkatunk."
by jsh March 01, 2005
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