Good old friend of mine, Trevor...errr rotund in build was called Porky at work. He never minded, gave as good as he got, often better.
Topher....Chris, a childhood friend.
Teef....Keith, a former colleague with stumps for teeth...Keith no Teef.
Shape...another former colleague from long ago, rotund in build, like Porky, it never bothered him.
Arse acher...Roy, a former colleague, surname Saker. R Saker.
Mine...Buttock. With a surname like Whittock, it's been twisted to Whitecock, Littlecock, Ticktock, you name it, I was walking in the workshop years ago, one guy looked up and shouted 'its Buttock

' That stuck for some years.