Have (got) (someone) pegged as (something) phrase
If a person "has someone pegged as something", he/she instinctively understands that person's type of character or knows what kind of person they are.
The local residents has the firefighters pegged as a brave guy.
I had got you pegged as a troublemaker, sorry for that misperception. You've just done a great job.
She had had Nick pegged as a total bore until he told her a funny joke.
The verb "have" should be conjugated according to its tense.
The verb "peg" in this phrase has a slang sense of "identify, classify" which is recorded by 1920.
Used when something unpleasant has happened that has spoilt what you intended to do
Oh, no, that’s torn it! I’ve left my wallet at home!