SHAM,
a Cheat, or Trick. To Cut a Sham; To play a Rogue's Trick.
· 
· 
Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
· ·
Sham in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).