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An Incestuos lesbian. Two sisters that have sex.
Twins that have sex with eachother in a porn are incestbians.
ayon kay Amanda Ferguson ika-24 ng Setyembre, 2007
Two related females participating in sexual acts together.
Isn't that her sister? Yes, they are incestbians.
ayon kay Merideth Factsterburny ika-25 ng Oktubre, 2010

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!
ayon kay Gloria Fanderbuilt ika-27 ng Oktubre, 2010