To me, it kind of sounds like a bastardized version of “English (UK)” with a Boston accent attached to it plus bizarre slang and strange spelling of some words (I.e. gaol is pronounced as “jail” I know, WTF? As I’ve thought they’re trying to spell goal).
The weirdest part are the different meanings of words that are spelled the same (I.e. “Thong” is defined as a swimsuit underwear in American English but from English AU, it’s flip flops) along with “C*NT” being part of their vernacular.
I think they sound silly sure, but I generally like them so it’s not in a mean way, just a “yeah these friends sound silly talking about their bin chickens, multiple marsupials, and such”