Definition of twatted:
(adj) :
(vulgar, slang, UK, Ireland, Commonwealth) Extremely drunk, intoxicated
(adj) :
(vulgar, slang, UK, Ireland, Commonwealth) Extremely or profoundly injured, usually as a result of deliberate action by another party.
(adj) :
(vulgar, slang, UK, Ireland, Commonwealth, in combination) Having a particular sort of vagina or vulva.