I guess humor (or that's humour for you) is a subjective thing. Most "yanks" have a good sense of humor, but a lot of us just don't get the "septic" Aussie slang. Personally, I don't know of any American slang for Australians. Perhaps, it's because we just don't think of you guys like that. In retrospect, I suspect we should be flattered by being so honored (or honoured for you) by this special "septic" title. I guess it means Americans are a big topic of conversation in the land downunder. The only time we think of Australia is when we see Elle McPherson, Kylie Minogue, or lofting a Fosters.