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1.
of or pertaining to incest.
"that steamy hookup between you and your brother was so INCESTY!!!"

"the way that he touched his cousin from Alabama was so incesty"

"eeew grandma stop pinching my butt! that's so incesty!!!"
de harrypotterchick503 9 juillet 2006
 
2.
playing footsies with your relatives.
it's okay to play incesties with your cousins, but not to bang them.
de smithfamilyreunion10 16 juillet 2010
 
3.
the act of having extreme relationships within your family tree.
"You and your cousin are hideously incesty!"
de GanjaRose. 16 mai 2009