Green’s Dictionary of Slang

1. (UK Und.) the practice of passing counterfeit money.

1839		H. Brandon Dict. of the Flash or Cant Lang. 165: Slumming – passing bad money.
1857		in ‘Ducange Anglicus’ Vulgar Tongue.
1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.

2. (US Und.) the practice of stealing packages of bank bills.

1859

Matsell Vocabulum.