To release gas from the anus, so that the air becomes very warm, and moist (like a sauna), but brown from the source.
by Rensta April 29, 2008
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...
by ^^!$#@ October 12, 2019