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A person either a guy or a girl who isn't quite sure of their sexuality yet.

It's a phase that everyone goes through in some point of their life.
-What's with tony posting all these pictures of hot guys on Damien and Sophie's wall? I thought he was straight?

- Tony? yeh, no he's actually undecided
by Livinglifebytheseconds September 21, 2010
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Somebody, usually a girl who likes other girls but is afriad to become lesbian. She thinks she is confused but she likes only girls.
girls with the names Sarah, Nicole, Megan, and Lisa are commonly undecided.
by ur person October 15, 2008
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