General term for an unkown item. A common Australain colloquialism. Used whenever you can't remember what something is called.
Wife: Where are the car keys?
Husband: On the bench.
Wife: Where on the bench?
Husband: Over there, next to the doovalacky.
Wife: Oh, next to the doovalacky, why didn't you say so in the first place.
A word that takes the place of an item or product that is difficult to name. Derived from a famous store people could buy things that couldn't be found anywhere else.
"You know, the place that sells those things, thingos, whatchamacallit, ahhhh....dooverlackies"
"You want what? Well, you've got two chances, DOOVERLACKIES and none"