Mariah is Californian, and uses a uniquely-Californian lexicon. One of her favourite stock phrases is: “[adjective]-ass [noun]“, i.e., “crazy-ass doll”, “stupid-ass bitch” or “expensive-ass car”.
Sometimes, I mentally move the invisible hyphen one word to the right because “crazy ass-doll” makes for a far more entertaining mental image than “crazy-ass doll”. A doll-shaped ass? A doll modelled after an ass? A doll for your ass?
The entertainment never ends!