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