beer skivvy
the consumption of enough beer to enhance the drinkers ability to withstand low temperatures at outdoor gatherings regardless of the appropriateness of the clothing being worn at the time.
You attend a lunch time BBQ wearing your shorts and a singlet in the heat of the day, you then drink until early hours of the morning the following day still wearing only the shorts and singlet (plus possibly with a newly formed hat made from an empty carton of beer) and your are feeling so very comfortable and warm wearing your beer skivvy even though it is now 15 degrees colder.