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A straight girl who hangs with lesbians, has lesbian bff's, and parties with lesbians. She drags her lesbian friends to straight bars so she can do eye exercises on hot guys, but can also bring down the house at the lesbian bar and not be turned on in the least by all of the femme fatales around her.
At a hip mixed lesbian bar in LA:

Bev: Who's the fun-loving hottie?

Yvette: She's a friend of Vi's, but she's a lesbonista!

Bev: Damn, why is it that all the gorgeous, fun women are straight?
by Lovin' Livin' April 27, 2011