POPS,
Pistols, To pop, to fire a Pistol, &c.
Pistols, To pop, to fire a Pistol, &c.
Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Pops in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).