"Deceitful or dishonest behaviour", Late 19th century: probably a variant of Scots joukery-pawkery, from jouk.
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This late 19th-century expression means ‘deceitful or dishonest behaviour’. It is probably a variant of Scots joukery-pawkery, from jouk ‘to skulk’.[jiggery-pokery etymology, jiggery-pokery origin, 英语词源]