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1.
Someone who is useless at being gay.
Someone who is either new at being gay or just doesnt know how to be.

John: Did you hear that Dave just came outta the closet?

Sam: Yeh hes such a Nooby Gayboy

Dave : I didnt know George Michael was gay!

William: Oh your such a Nooby Gayboy!

"I felt like such a Nooby Gayboy last night when i almost gagged"
by InstantaniousMan January 02, 2012