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gayin it up is basically not wanting to help or join others in time of need, not co-operating, or when someone is just being VERY difficult and/or selfish.
OR just acting in a homosexual manner.
Tom does not want to play Xbox with us there for he is gayin it up.,

Stop gayin it up and come with us to the club.,

those men over there holding hands are gayin it up.,
by Phillip Jennings September 16, 2007