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1.
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.
door robin lillian 16 juli 2006
 
2.
Incest/Lesbianism. The term is generally used jokingly.
Girl to sister: Aw, I love you! *Pecks sister's lips*

Sister to girl: I love you, too!

Bystander: Fucking incesbians...
door Carla Toolie 26 augustus 2010
 
3.
A lesbian who only licks her sister's twat.
That big dike is an incesbian.
door cm69 24 februari 2011