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1.
The opposite of no worries.

A retort used to impose a reality check on an idiot -- Australian or otherwise -- who attempts to dismiss a worrisome situation with their inappropriately optimistic bullshit.
Non-Australian: This software is buggy.
Australian: No worries, mate!
Non-Australian: Worries, mate. Worries.
Australian: No worries.
Non-Australian: STFU, you don't have to support it! Worries, I tell you! Worries!
by Charlie Bravo March 18, 2008
 
2.
action of a dog seizing an item with its teeth and violently shaking its head from side to side in an effort to kill whatever the item is.
i know why that boot is all tore up, i saw the dog worry it.
by viciousk June 10, 2009