i have crossed between and american english and australian accent, what whould Ты call that accent?

I don't think there's an official term for it.

BUT when Spanish speakers mix English and Spanish, Americans call the result Spanglish.

How about calling an American-Australian accent something like "Amerilian" или "Australican"?

(Another thing: Some Americans confuse AUSTRALIA with AUSTRIA. So Ты may need to explain that too, ie that Ты do not come from the place that brought the world 'Sound of Music' etc. Mention Australia's koalas или Great Barrier Reef; people from the USA HAVE heard of those and identify them with Australia).

Austrailican?

Oh, I don't know...trans-Pacific? xD

ameglalian!

Ты have an American and Australian accent? how is that possible?