"Auf Wiedersehen Pet" was a very popular British programme about a team of brick workers who move to Germany to find work. You might have bother understanding their English because their accents were really broad. Jimmy Nail was one of the Geordie characters but there were others from the midlands as well as Kevin. I don't remember if Kevin actually sang anything but Jimmy Nail certainly did. There may have been some drunken pub singing and presumably Kevin would have joined in then.
The comedy came from the way the cultures clashed, the language problems and misunderstandings.
It was quite popular here in NZ and there were several seasons and a couple of spin-off series - one even in America, somewhere out in a desert.
My Geordie friend calls me 'pet' all the time - it's a common term of endearment in the north, like luv or mate further south.
Auf weidersehen pet is what they said to their girlfriends/wives as they headed off to Germany, or at any time they were saying goodbye or even just goodnight.
Robyn