Riotous bucks, who amuse themselves with breaking windows, beating the watch, and assaulting every person they meet: called scouring the streets.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Scour * ScoutNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes