No, a pillock is not a fish. It is a slang term used in British English to refer to a foolish or stupid person.
you can say " twit" or "blockhead'
A slang word for somebody foolish
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A berk is a pejorative or slang term for a foolish person.
"Cheesy bellend" is a derogatory slang term that can refer to someone who is viewed as gross, irritating, or foolish. It combines the British slang term "bellend" (slang for the head of the penis) with "cheesy" to emphasize the negative characteristics of the individual being described.
A bampot is a Scots slang for an idiot, or an objectionable and foolish person.
A "blooming idiot, is referred to as a foolish person who consistently makes mistakes or idiotic choices. The word blooming is a British slang expression meaning to a great degree.
In British slang, barmy means crazy or someone has gone mad/loopy-loo. For example: 'I say Jenny you have been acting rather barmy lately!'
That is the correct spelling of slang word "cockamamie" (ridiculous, foolish).
"Daft prick" is a derogatory term that is commonly used in British English to insult someone as being foolish or stupid. "Daft" means silly or foolish, while "prick" is a vulgar slang term for a person, typically used in a derogatory manner. Therefore, when someone is called a "daft prick," it is a harsh way of saying that they are acting foolishly or being an idiot.
"Hogwash" is a slang term used to describe nonsense or foolish talk. It is often used to dismiss an idea or statement as untrue or illogical.