"Prat" as slang is a British English term, typically used as a noun, meaning an incompetent or foolish person; it's often used as an insult.
The Collins English Dictionary defines "prat" as: "(præt ) noun. slang. an incompetent or ineffectual person: often used as a term of abuse." This definition highlights two key aspects of the word:
- Incompetence/Ineffectiveness: It suggests someone is incapable or fails to do things properly.
- Abuse: It's frequently employed as a derogatory label.
Therefore, calling someone a "prat" implies you think they are acting stupidly or are generally inept. It's important to note that while relatively common in British English, its usage elsewhere may not be well understood or considered as strong an insult. The severity of the insult can depend on the context and tone of voice.