What is Liquid Long Johns?
1.
The alcoholic sweater you wear on the inside, often giving you "warmth" in a number of drunk situations... mostly used in cases of courage or extreme stupidity...
Katie, the tube-top wearing, miniskirt-sporting hoochie mama took 8 shots of vodka and climbed into her liquid long johns, allowing her to brave the sub zero temperatures outside, thus leaving her jacket at home.
See