Incestion 

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

Woah, you got your mom pregnant? Then that child? INCESTION!

Incestion by Lily69 June 13, 2012

Incestion 

INCESTion is the act of fucking your wife while she's pregnant and sticking your penus soooo far in that it goes In your babies mouth. Therefore, you are somewhat being an incest.

That incestion last night was sooo good. My baby is gona come out sucking dick like a pro.

Incestion by ILoveCheesecake November 4, 2011

Incestion 

When one member of your family wants you to have sex with another member of your family.

"I want my sister to fuck my dad!"
-"Whoa, Incestion!"

Incestion by Marxe August 26, 2013

incestion 

When doing 69 with an exact replica of oneself, the person is giving pleasure to themself while reciving pleasure from themself, thus creating a split in the universe

-I saw a guy 69ing with his clone

-Are you crazy? I heard incestion was impossible!

incestion by orangekiwicoconut September 28, 2011

Inception Fart

When someone farts into another persons butt. The other person mixes the fart around inside them, then farts it back out. It is a fart within a fart.

Sharon: "baby, I want us to move our relationship to the next level...I think we should create something together."
Ben: "I love you Sharon, but I don't think I'm ready for kids yet."
Sharon: "kids!? No! I want us to make an inception fart!"

Inception Fart by Mattybizzle September 19, 2013

incesting 

committing incest on a regular basis.

having sex with your mom on a regular basis would be considered incesting

incesting by Baybee Becky October 20, 2008

Your ancestors incestors 

the incest family tree

Carl: "your mum gay"
John: "your dad lesbian"
Carl: " your granny tranny"
John: "your grandpap trap"
Carl: "your sister a mister"
John: "your family tree LGBT"
Carl: "dont make me do it to em."

John: "do it Carl"
Carl: "your ancestors incestors."
John:
Carl:
John:
Carl: "you know i had to do it to em"
God: 'bows down before Carl'

Your ancestors incestors by Yourancestorsincestors81 March 24, 2018