noun
pillock
PIL-uk/ˈpɪlək/
A stupid or foolish person.
He acts like a pillock when he ignores good advice.

Etymology
Middle English pillicock named the penis. Its descendant pillock later became an insult for a foolish person, shifting from a sexual term to personal abuse.
In context
like this pillock here who comes along and like no I got B and then just goes and and tries to put together an argument which was [ __ ] embarrassing
More examples
- I felt like a pillock after locking myself out.
- Some pillock parked across both spaces.
- Stop being pillocks and listen to the instructions.
Forms
pillock · pillocks