'Prost' is roughly translated as, 'Cheers.' When I was a young soldier stationed in Baden-Wurtembourg, we freely interchanged Prost with 'Brust.' Brust is German for breast. An obvious choice of pun's for a young soldier. I too (well, almost) married a German woman, thus I am very familiar with the play on words, as it were. In short, its Prost!!