This phrase is ussualy added onto a compliment you extend to your brother/sister/mom/dad, but don't want to make it sound... incesty and akward. Just like the phrase, "No homo". Then no one can accuse you of incest.
by c00lbeans February 20, 2011

by Baybee Becky October 20, 2008

by JJ July 30, 2003

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

by toxic cowZ May 26, 2018

by Alison Chaynes May 22, 2009
