Top Definition
A woman who is in a lesbian relationship for a while but realizes she is not a lesbian.
Lindsey Lohan is totally a oncebian, she'll leave Samantha for a man soon!
by LaraAnn November 16, 2008
Originated from the hit TV show "Greys Anatomy", meaning "to be a lesbian once"

Also "Twicebian" meaning "to be a lesbian twice"
Yang: It wasn't like she was your girl friend...Oh, so you're a lesbian?
Mcsteamy: More like a oncebian
Kally: Or maybe a twicebian, I dont know.
by Greyfan1 November 14, 2008
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