Sexual intercourse between persons too closely related to marry (as between a parent and a child). Also incest is between brothers and sisters.
"Dude! Did you hear about that Sion kid?"
"No"
"He totally slept with his step-sister"
"Ew man, Incest"
"No"
"He totally slept with his step-sister"
"Ew man, Incest"
by RudeBoyz8734 July 18, 2009

by TheNoodleGod2012 August 4, 2012

The act of calling your relation your boyfriend
by Wise papi September 13, 2019

by bakfjeidfjhgjriedfjgnjrkerjfhg April 15, 2021

by Leebobs May 4, 2018

by Baybee Becky October 20, 2008

Getting your own mother pregnant, then getting that daughter/sister pregnant. Therefore, it's a sister within a sister. Inception + Incest = Incestion
by Lily69 June 13, 2012
