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Used to describe a location that is actually a front for anonymous gay sex. Generally include facilities for both whatever business it officially is, and facilities for the gay sex.

Generally frequented by curious married men and elementary school teachers.
We don't like to stay at the YMCA, it's totally a white swallow spa.

Bring your own sheets to that motel, it's a white swallow spa.
by BCP on PCP October 11, 2011
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