In 1942, angry Nazi ranting was measured at an unprecedented level of 120 degrees Fahrenheil, whereas in 1947, this amount had decreased to a calm, cool 68 degrees Fahrenheil.
The German car manufacturer, BMW has often used this phrase in its marketing efforts. Loosely translated to English, it means "driving pleasure" or perhaps "the joy of driving." This phrase seems to be consistent with their best known marketing catch phrase, "The Ultimate Driving Machine."