Thesbians (n): a cross of the two words "thespian" and "lesbian" to describe two females involved in the same theatrical production, thespians, who act like a female homosexual couple, lesbians, despite the heterosexuality of either or both of the females.
"Sally and Susie are thesbians."
"Sally are Susie are in thesbians."
"The whole cast is in thesbians with each other. Even the guys."
"The girls' dressing room was one big thesbian orgy."