Incestist 

The act of discrimination against people who are in the an incest relationship. Word Origins: combination between Incest and Racist, First used by a Weeaboo on Youtube that goes by the name of Double4anime.

if you don't support incest, you are incestist

Incestist by Rimic June 21, 2016

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

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

incesticide 

incest- sexual intercourse between people within the same family.

suffix- icide- to get rid of. (e.g., pesticide)

a kick ass nirvana album.

incesticide is one of the best nirvana albums.

incesticide by dead is grunge April 25, 2004

incesties 

playing footsies with your relatives.

it's okay to play incesties with your cousins, but not to bang them.

incesties by smithfamilyreunion10 July 17, 2010

Incestigate 

When a sibling detective squad hooks up with each other during or after an investigation.

After solving the Mystery of the mysterious mystery, The Hardy Boys went back to their place to Incestigate. All Night Long.

Incestigate by androoxc November 2, 2009

incestating 

The act of dating your sibling.

Mom: Where are you and your brother going?
Mary Sue: Billy Bob and I are going incestating!
Billy Bob: I'm gonna' get me some of that good sister lovin'.
Dad: Billy Bob, you know I shoot at anyone who tries to date yur sister, but since you are my boy I guess I'll let it slide tonight.
Mom: Have a good time and practice safe sex you silly kids.
Dad (to Mom): Come on and watch TV with me, it's our favorite show, "All in the Family".

incestating by The Evil Minister July 16, 2008