Green’s Dictionary of Slang

spear n.

1. [20C+] (Aus.) as the spear, dismissal from a job.

2. [1930s+] (US drugs) a hypodermic syringe.

3. [1980s] (US Und.) a pickpocket.

In phrases

get the spear (v.) (also get the gun, …harpoon)

[late 19C–1960s] (Aus.) to be dismissed from a job.

SE in slang uses

In derivatives

spearo (n.) [-o sfx (3)]

[1960s–70s] (Aus.) a spear-fisherman.

In compounds

spearchucker (n.) [1950s+] (US)

a derog. term for a black person [the image of the African tribesman as a ‘primitive’].