Brown Sauna

To release gas from the anus, so that the air becomes very warm, and moist (like a sauna), but brown from the source.

I ate so much taco bell today, my room is a brown sauna.

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Brown Sauna

Wearing dirty undies in a car when the driver turns on the heated seats - releasing the sewer-like armoatherapy into the cabin.

i was in the car after two days at a festival and my friend turns on the heated seats - i knew within 2 minutes it'd be a brown sauna...