Green’s Dictionary of Slang

quolleckcackle n.

[? Lat. quo, which + cackle v. (2)]

(UK Und.) a criminal who betrays his associates.

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[UK]Duncombe New and Improved Flash Dict. n.p.: Quolleckcackles cowardly rogues who through fear, betray, and impeach, and become witnesses against their companions in guilt.