Green’s Dictionary of Slang

gingumbob n.

a trifle.

c.1698		B.E. Dict. Canting Crew n.p.: Gingumbobs, Toies or Baubles.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
1785, 1796		Grose Classical Dict. of the Vulgar Tongue.
1789		J. O’Keeffe Modern Antiques (1792) 36: What a fine rummage we have made among her falderals, trinketies, and ginglibobs.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1859, 1860		Hotten Dict. of Modern Sl. etc.
1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.