Two related females participating in sexual acts together.
Isn't that her sister? Yes, they are incestbians.
by Merideth Factsterburny October 25, 2010
An Incestuos lesbian. Two sisters that have sex.
Twins that have sex with eachother in a porn are incestbians.
by Amanda Ferguson September 24, 2007
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!
by Gloria Fanderbuilt October 27, 2010

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