Green’s Dictionary of Slang

1. (Aus.) a try, an attempt; thus have a ping at, to have a go at.

1977		(con. 1941) R. Beilby Gunner 166: Was he having a ping at the Boy-Bastard, or something?
1988		Herald (Melbourne) 1 May 19: She was near last at the 200 metres and when Robert (Heffernan) pulled her out she decided to really have a ping.
1998		S. Maloney Nice Try 273: Twenty yards from the goal-mouth, he steadied and took a ping.

2. (N.Z. drugs) an injection of a narcotic drug [ping v. (3)].

1982		G. Newbold Big Huey 252: ping (n) 1. Dose of narcotic in a syringe.
1986		Eve. Post (Wellington) 5 Apr. 19: Peter’s early-days addiction routine started with a ‘ping’ in the morning and a cup of coffee [DNZE].
1999		D. Looser ‘Boob Jargon’ in NZEJ 13 34: ping n. A dose of drug administered with a needle.
2001		D. Looser Boobslang [U. Canterbury D.Phil. thesis] 140/2: ping n. 1 an injection of intravenous drugs.