nut

IDK where it is from but a couple of Aussies use it as another way of saying no or nah.

"Oi Sandra, you want another bikkie?"
"Nut, I'll pass."

Out of puff

Mostly Aussie means that you're out of energy.

"Can I have a break from walking for a second, I'm out of puff mate."
"Nah, stop being lazy."