Nah, yeah. Negations aren't rare in Aussie speech (see "litotes": https://en.wikipedia.org/wiki/Australian_English#Vocabulary https://en.wikipedia.org/wiki/Aus

Nah, yeah. Negations aren't rare in Aussie speech (see "litotes": https://en.wikipedia.org/wiki/Australian_English#Vocabulary https://en.wikipedia.org/wiki/Australian_English#Vocabulary). If you're not too fussed about the less than positive implications, you can even use it for emphasis. No reason not to embrace it.