Similar to being a transvestite or a poser, a Lesbianite is the product of a straight girl pretending to be a lesbian. This is usually temporary and last for one night but can sometimes be for an extended period of time, especially when she's whoring herself out for attention and/or money, drugs are also a possibility.
EX 1.) Did you hear about Gynette's vice of being a lesbianite? She totally whored herself out for more college money and beer last night at that drag party, what a slut.

EX 2.) Girl 1. "Dude, I totally need more drugs and I don't have any money."

Girl 2. "Hey, Lady. Lets become Lesbianites and make some hard cash tonight at the drag party."

Girl 1. "Yeah, LESBIANITES UNITE!"
by INVERTED PENTAGRAMS October 15, 2009
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