I have a sticker on my rear window it says FAHVERGNUGEN, so I wondered what
it means.

June 1992
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Dear Tom and Ray:

What is Fahrvergnugen? No one we know has any idea, including one who speaks
German. We're beginning to think it's a made-up word and doesn't mean
anything. Debbie

Ray: Farhvergnugen is the slogan Volkswagen started using in its
advertisements a couple of years ago. When we first saw it, we thought it
was German for "precipitous decline in U.S. sales."

Tom: But after checking with three prominent gastroenterologists and the
doorman over at the German Consolate, we've determined that it actually
translates to "the pleasure of driving."
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Credit:
http://cartalk.cars.com/Columns/Archive/1992/June/07.html