A derogatory term started by Australians to describe recent British immigrants. There is no proof that it had to do with the acronym Prisoners of Her Majesty. It is more likely that it was an abbreviation of the word pomegranate and referred to the flush complexion of Brits (like a pomegranate's flesh) or it was chosen to rhyme with immigrant (like "Larry Flint").
Low life bags of shit from the UK.
Mostly travel in packs of backpackers and drink beer untilt hey spew in the gutter. They never bathe and have foul potty language and are tightasses - favourite foods beer and curry.