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 January 31, 2011
by Baybee Becky September 2, 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 March 6, 2012
by toxic cowZ April 15, 2018
by Alison Chaynes May 22, 2009