Derived from the word 'wretch' (poor, despicable, inferior, pityful).
(ratch, noun). The girl who thinks she's hot she's actually ugly and unflattering, probably being sloppy and obnoxious, and has a big attitude.
(rachet, adjective). Not on-point (clothes, hair, etc.)
You have fun singling out these girls and violating or shit talking about them, especially if you don't like her in particular.
She look nasty, she ratchet.