A room in most American homes which contains about 12" of dense clay and water, mixed to the consistency of a heavy paste. When you enter the house you remove all your clothes except for your shoes and slather the mud on yourself, whilst singing classic American show tunes at the top of your lungs to announce your presence. The host will unlock the door, spray you down with a fire hose and greet you with a hearty slap on your bare ass and a cigar.

It’s just an American thing, you dirty foreigners wouldn’t understand.