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When a man takes off his pants and under garments, but leaves his shirt on. His testes are said to be going freebird since they flop around in the cool breeze when he walks. This commonly occurs in locker rooms outside of pools and gyms, especially with old people for some reason.
Mike: "Oh my god there are so many old people here going freebird! Save me!"
John: "Hell no I'm not going in there! I don't need to see old people's balls! You're on your own."
by COD KILLA June 24, 2014
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