chop-chop

(AU, slang) Not very good; unimpressive; of poor quality.

(slang, vulgar) A term of abuse.

A coarse, vulgar British and Australian insult used to call someone a complete idiot or fool — the kind of person who reliably does the wrong thing at the wrong time. It sits in that category of inventive compound swear words where the combination of parts is designed to be more emphatic and absurd than either component alone. While not part of polite vocabulary, it's colorful in the way a lot of Antipodean and British invective is — more theatrical than vicious, aimed at stupidity rather than malice.

(British India, slang) Keep quiet.

(Midlands, Wales, Bermuda) To loudly insult and subject to verbal abuse; to berate.