Green’s Dictionary of Slang

(Aus.) a racecourse tipster, thus tipslinging, offering supposedly inside information on racehorses.

1896		Truth (Sydney) 8 Mar. 1/6: With a hansom with Carbine in the shafts and a pretty knack of tipping winners, the combination of cabby and tip-slinger should be remunerative.
1896		Truth (Sydney) 19 Apr. 7/5: He had a fine catholic taste for tip-slinging [...] and ususally gave each victim a different horse.
1900		Sydney Sportsman (Surry Hills, NSW) 17 Oct. 1/3: Remember, the tip-slinger who has a ‘dead cert’ is quite truthful — he has. It’s always a dead cert for the fly-flat to fall in.
1903		Sun. Times (Perth) 26 July 1/2: The W.A.T.C. is growing none too particular in its licensing of new bookmakers. One of the latest is a notorious tip-slinger newly arrived from the east.
1904		Sydney Sportsman (Surry Hills, NSW) 12 Oct. 4/2: [N]ot a pony meeting passes without they are on the course tip-slinging and fleecing guileless young men .
1919		V.J. Marshall World of Living Dead (1969) 129: The race course urger (tip slinger), the magsman [...] never hesitate to express their contempt for the more roughly inclined of the profession.
1926		J. Doone Timely Tips For New Australians 22: TIPSLINGER. — The slang term for race-course tipster.
1930		L. Lower Here’s Luck 54: Tip-slingers, urgers and whisperers slunk like jackals through the crowd.
1941		Baker Popular Dict. Aus. Sl.
1955		N. Pulliam I Travelled a Lonely Land (1957) 240/2: tipslinger – a race tipster.
1966		J. Holledge Great Aust. Gamble 34: He certainly kept records and made a study of form on a scale never attempted by any other tip-slinger before or since.
1966		J. Holledge Great Aust. Gamble 35: [H]e publicly criticised three of the riders in one of his tip-slinging radio broadcasts.