Green’s Dictionary of Slang

bucket v.

[‘To bucket a person is synonymous with putting him in the well’ (Vaux)]

1. [19C] (UK Und.) to deceive, to cheat, to swindle, to ruin, esp. to rob an accomplice of their share of a robbery; thus bucketer n.

2. [1970s+] (Aus.) to disdain, to denigrate, to despise.

In compounds

bucket gaff (n.) (also bucket job) [gaff n.1 (14) / SE job]

[1960s–70s] (UK Und.) a fraudulent company.