Top Definition
a person who characterizes himself or herself as straight, but occasionally dabbles in sexual conduct with a partner of the same gender.

Originated from Vassar College students, who tend to find themselves somewhat hereto-flexible during their college years.
Emily: I saw the guy I have a crush on hooking up with another guy in the Mug last night. I don't know what to think...

Sarah: Oh, don't worry. He is Vassar Straight.

by cockmaster23 September 16, 2008

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