dishonest or suspicious activity; nonsense
"[Greece] flouted European Union rules on the limits to budget deficits; its national accounts were a moussaka of minced statistics, topped with a cheesy sauce of jiggery-pokery." Jeff Randall, The Telegraph, May 20, 2010
About the word:
Jiggery-pokery is an alteration of joukery-pawkery. Both joukery and pawkery are English regionalisms for "trickery."