typically happens in colder climates in the winter when you have been in a bar or warm indoor climate for a significant amount of time and your butt starts to sweat. When you leave and go out side, all of a sudden you have icicles in the crack of your ass from frozen sweat.
A homeless person or bum who rejects offers for shelter in arctic condition, freezes and becomes part of a snow bank, but doesn't die due to a combination of drugs & alcohol in his or her system, normally on the side of a road in an urban area.