incestbian 

Two related females participating in sexual acts together.

Isn't that her sister? Yes, they are incestbians.

incestbian by Merideth Factsterburny October 26, 2010

Incestbian 

Noun,

1) 2 or more women in an incestuous relationship.

2) A lesbian who is attracted to members of her own family.

That girl hangs out with her sister too much, I swear, she's such an Incestbian!

Incestbian by Gloria Fanderbuilt October 28, 2010

Incestbian 

An Incestuos lesbian. Two sisters that have sex.

Twins that have sex with eachother in a porn are incestbians.

Incestbian by Amanda Ferguson October 8, 2007

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

Incesbian

A lesbian who only licks her sister's twat.

That big dike is an incesbian.

Incesbian by cm69 March 11, 2011

incesbian

a female who participates in a sexual relationship with another female relative (sister, cousin).

no one in the family quite knew how to talk about the sisters incesbian relationship.

incesbian by robin lillian July 16, 2006