roo sack 

The nut sack of a kangaroo.

That guy is a real roo sack

roo sack by Kentodore May 19, 2016

two tugs on a roosack 

An Australian saying introduced late 2000's, derived from a reasonably well known saying from across the ditch: "two shakes of a lambs tail".

Used as a measure of time - in the not too distant future.

Mate 1: You got a minit mate?
Mate 2: True blue mate, I'll be there in two tugs on a roosack mate.

two tugs on a roosack by TrueBlueOcca February 8, 2010