Aussie Slang

My friend Ross is studying at Oxford at the moment and he sent me this message today:

"By the way, did I tell you that one of the Australians I met here said "I'm doing a Joe Roff" the other day - rhyming slang for "I'm off"? I now understand from his Wikipedia entry that it's not the only rhyming slang associated with his name: "During his years with the Wallabies, the rhyming slang term 'Joe Roffie' gradually worked its way into to the Australian vernacular, being an abbreviation for coffee." To think I never knew."

I didn't know this either. "Joe Roff for a Joe Roffy".