"pillbo x....army...soldier ....sodjee....."
I don't like bringing up the "E" word with a Scotsman, but I had a good friend - English - from London who explained English slang the same way. You start with one word, then by a weird chain of associated words and mutations it ends up as something completely different, yet maintaining a form of the original meaning.
It seems so ideosyncratic that it amazes me that two people can understand it, much less a whole country!
Not criticising, just sayin'! Words are wonderful things.