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n. a straight girl who dates another girl (who is lesbian or bi) temporarily, even though she knows she is straight. Usually is more than a barsexual, but is straight nonetheless. In other words she is a "guest" in the lesbian community. (Guest+lesbian=guestbian)
Sara dated James for 3 years and then Tyler for 2 years, but after he dumped her she dated Jenny for 3 months before moving on to Nick, therefore making her a guestbian.

Sara is straight. Jenny was her rebound.

Welcome to the lesbian community, we hope you enjoy your stay.
by Annaliseeeeee April 09, 2011
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