Green’s Dictionary of Slang

bludger n.2

[SE bludgeoner]
(Aus.)

1. [late 19C+] a pimp.

2. [late 19C+] (also bluders, bludger-boy) a general term of abuse, usu. implying that the person in question lives off the efforts and money of others.

3. [1910s+] a white-collar worker (from the point of view of a manual labourer, who sees such work as idling).

4. [1940s] (also blodger) an idler, a lazy person or creature.

5. as a term of affection.

6. used verbally as euph for fuck v. (3)

In phrases

come the bludge on (v.)

[20C+] (Aus.) to sponge on.