Folk law I'm afraid. The prison uniforms never had ANY writing on them little own an acronym as seen in the paintings from the time. The word "pommy" or "POM" is academically recognised as being based upon the word "pomegranate", either because the redness of the fruit matched the sunkised pale English completion, or because (like "Johnny Grant") it was used as rhyming slang for "immigrant. Ps. There can however be no argument that they're all a bunch of sheep shagging Oi Oi Oi, shackle rattlers
Thank you Kiwi! Well there you go Comm. I was wrong about where it came from. That said. I was trying to argue that Aussies still aren't poms. We are. Kiwi argued it better than me.