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A heterosexual person who attends a dance/event/party with a homosexual person because either the homosexual is still in the closet or their partner/previous date could not attend.
"Chelsea doesn't want her parents to know she's a lesbian so she brought Dave to be her straight date when she met them up for dinner."

"Joe's boyfriend had to work so he asked me to be his straight date to his company picnic."
by PrincessJetta October 23, 2008
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