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1.
Does not, in fact, mean someone who is homosexual while high. Comes from day-trip, and refers to a male or female who is mostly straight but sometimes has a one-night stand with a member of the same sex for the hell of it.
"You see John with that guy over there? I thought he had a girlfriend last week"

"He'll have another one soon, he's just a gay-tripper"
by LeiseMaus October 05, 2009