See quotation.
1841. When a small boy, I went to school in a Scotch-Irish neighborhood, and learnt many words and phrases which I have not met with since; among the rest was shake-poke. [When a meal-bag] is nearly empty, it is turned upside down and shaken; and the meal that comes out last is called the shake-poke. The last child [of a family], like the last meal, is called a shake-poke.Mr. Benton of Missouri, U.S. Senate, Aug. 25: Cong. Globe, p. 380.