In Two Shakes Meaning

Example : 1906, Edith Nesbit, The Railway Children, ch. 2,  She tried to get the case open. . . . "I wish Father was here," said Phyllis; "he'd get it open in two shakes."1910, William MacLeod Raine, A Texas Ranger, ch. 5,  I'll have coffee ready in two shakes of a cow's tail.1922, Agatha Christie', The Secret Adversary, ch. 19,  I'll be back in two shakes of a dog's tail.1922, P. G. Wodehouse, Right Ho, Jeeves, ch. 16,  In two shakes of a duck's tail Gussie, with all that lapping about inside him, will be distributing the prizes at Market Snodsbury Grammar School .2005, Adrian Higgins, "And All the Trimmings," Washington Post, 15 Dec, p. H01,  Skilled sheep shearers can get the wool off a ewe in two shakes of a lamb's tail.