I feel like this is another one of those America things

Yes it is

Well struth, if you're being dinky-di, you'll get a reply chockers with true blue, occa strine.

Ooo Idk what it is but sounds interesting

Translation: Well wow, if you're being honest, you'll get a reply full of Australian Australian Australian.
*The the first two Australians are verbs (like 'a characteristic of Australia'), the last one is a noun (as in 'a person of Australia'). There are a lot of words of Australian in Aussie slang.

Holy s*** I dont want to know what Aussie English class is like. Pls I'd rather mop your kitchen than listen to it ;-;

I didn't even get into the good ones. Try "I'm gonna drink with the flies, get a slab of turps from a bottle-o, because my mouth is as dry as a dead dingo's donger. It's your shout, so get out your shrappers."

Pls I beg you dont Id rather be on a skatrboard being dragged by Gumo 's white van