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