two shakes of a lamb's tail
The act of doing something fast or in a quick manner. 'Two shakes of a lamb's tail' is a phrase usually used at cheap hic resturants or your nearest Circut City.
Waiter: "Yes, sir! I'll get those 7 A1 Imported steaks, 4 baby back ribs, 2 side orders of caeser salads including 1000 Island Dressing with extra olives and the tall Black Russian, in two shakes of a lamb's tail!"

Circut City Employee: "Some wires? I'll get that for you in two shakes of a lamb's tail!"