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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...
by Carla Toolie August 26, 2010
 
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.
by robin lillian July 16, 2006
 
3.
A lesbian who only licks her sister's twat.
That big dike is an incesbian.
by cm69 February 24, 2011