Green’s Dictionary of Slang

1. (also con along) to fool a victim in one or another form of confidence trick.

1896		Ade Artie (1963) 25: Do n’t try to con me with no such talk.
1902		‘O. Henry’ ‘The Marionettes’ in Rolling Stones (1913) 79: It were vain to attempt to con such men.
1914		E. Wittmann ‘Clipped Words’ in DN IV:ii 138: con, from confidence. To swindle.
1938		A.J. Liebling ‘The Jollity Building’ in Just Enough Liebling (2004) 259: He asked me for a loan of three dollars so he could get his teeth out of hock to con a sucker.
1944		N&Q Nov. 116/2: Con. To inveigle an individual (either a criminal or an informant) into doing something by verbal trickery [DA].
1950		Goldin et al. DAUL 47/2: Con along (or Con). To practice the con.
1957		Kerouac On The Road (1972) 10: He was conning me and I knew it […] and he knew I knew.
1966		J. Mills Panic in Needle Park (1971) 11: The addict will beg for it, walk miles for it, wait hours for it, con for it.
1975		E. Torres Carlito’s Way 36: She was going to con a con man. Ha!
1982		P. Bailey Eng. Madam 57: He was a different kind of con man, though. He conned with class.
1998		I. Welsh Filth 37: A sponging alcoholic jakey who manages to con rich liberal wankers intae believing that he’s some fucking intellectual.
2000		Indep. Rev. 26 Jan. 16: Bradley also said he had never conned anybody who couldn’t afford it.

2. to persuade, to coax (without criminal intent); usu. as con someone into.

1899–1900		C.L. Cullen Tales of the Ex-Tanks 309: Well, we both started out to con that young man.
1911		G. Bronson-Howard Enemy to Society 294: She says as how Steve wasn’t tuh blame fer makin’ th’ touch ’cause she’d ’conned him into it.
1931		D. Runyon ‘The Lily of St. Pierre’ in Runyon on Broadway (1954) 141: Louie [...] cons her into coming over there to him.
1947		B. Schulberg Harder They Fall (1971) 221: I try to con him out of it [i.e. a foolish plan].
1955		B. Schulberg On the Waterfront (1964) 14: I look to con him out of my way with some soft soap.
1969		‘Iceberg Slim’ Mama Black Widow 67: He tried to con the cops he didn’t know.
1972		P. Fordham Inside the Und. 110: Respectable people conned into business enterprises with strange fellow-directors.
1984		A. Sayle Train to Hell 59: He’s conned Methuen into letting him write this book.
1991		M.B. ‘Chopper’ Read Chopper From The Inside 89: The Turk tried to con me to go outside.
2001		J. Stahl Plainclothes Naked (2002) 109: The trick was not to con himself that she was solid if she wasn’t.

3. to tell stories, to fantasize.

1954		E. Hunter ‘. . . Or Leave It Alone’ in Jungle Kids (1967) 55: Don’t con me, cop [...] They’ll give me the Lexington choice.
1966		T. Keyes All Night Stand 63: Gerry conning away like mad about some improbable situation.
1981		J. Ellroy Brown’s Requiem 158: Don’t worry, I’m not conning you.