A Saint Thomas refers to a method of washing oneself that is fairly similar to showering and bathing at the same time.
One fills their bathtub with up to 6 inches of water. Said water is exceptionally hot, but nevertheless, at a temperature the practicer can comfortably stay in. Then, one turns on the shower, moves it to the wall close to them, and lies down on their back
in the bathtub for most of the time. The bathroom should get steamy and extremely humid, which is part of the pleasure.
The name was chosen due to how the Caribbean island of Saint Thomas was a former Danish colony. Denmark is considered to be a Northern European country, and the sauna
originated in Finland, a country also in
Northern Europe. This method is likened to a sauna, and also likened to the tropical, humid climate of many Caribbean regions.