Green’s Dictionary of Slang

(orig. US) to trick, to cheat; thus n. slumgazzle, fraud, trickery.

1869		C.G. Leland ‘Breitmann in Politics’ in Hans Breitmann About Town 61: He shvore bei Leib und Leben / He’d rader hafe been licked / Dan pe helpet bei soosh shumgoozlin.
1876		Atlanta Constitution (GA) 7 Oct. 2/2: The canting scoundrel [...] is the pricipal participant [...] of the ribaldry, crime and slum-guzzling of the lowest and dirtiest negro den in the city.
1907		Eve. Star (Wash., DC) 17 Nov. 4/2: About nine out of ten of the yarns about how wealthy the chaps who abandon the game [and] proceed to get in business enterprises are pure slumguzzle.