Top Definition
When the act of adoption or not knowing family tree, results in finding out your related to someone you've preformed sexual acts with.
Mom: I don't want you seeing her anymore!

Son: NO! I WONT! I LOVE HER!

Mom: So do I, shes my Niece!

Son: OH MY GOD! WHAT THE FU@K!

Oops-cest isn't always your faul! Ewww!
by RickySTEEZ December 07, 2009
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