Questions about example sentences with, and the definition and usage of "Twat"

A: It is an insult to call someone a twat. It's a rude word for vagina, and calling someone a twat is not as bad as using another rude word for vagina on someone, but it's still an insult. It sort of implies that someone is stupid and/or annoying. But, it's ruder than 'stupid' or 'annoying'.

A: Female genitals

A: Hahaha it is basically another way of saying idiot/moron/stupid
There are loads of slangs that mean stupid to be honest.

A: Probably best you don’t use it. It can also be extremely vulgar.

A: Avoid using this word - unless with close friends in a very casual situation.

It means “jerk” but it is very vulgar and frankly obscene, and you will be judged badly for using it in any but the most relaxed of circumstances, in which you are with people who are happy to use vulgar words.