Mirret is a slang term used as an alternative to the surname Mowatt. It is used by people who speak with a broad Scottish accent and struggle to pronounce certain words.
See that fucking Mirret, am going to burst him one day with the end of my rifle
This refers to a women who has extremely hairy genitels. Often used as a derogatory term
See last night mate, a gave that girls groof a lick out.