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1.
An Incestuos lesbian. Two sisters that have sex.
Twins that have sex with eachother in a porn are incestbians.
od uživatele Amanda Ferguson 24. Září 2007
 
2.
Two related females participating in sexual acts together.
Isn't that her sister? Yes, they are incestbians.
od uživatele Merideth Factsterburny 25. Říjen 2010
 
3.
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!
od uživatele Gloria Fanderbuilt 27. Říjen 2010