Green’s Dictionary of Slang

(US black/campus) a woman seen as being extreme in behaviour; thus characterized as promiscuous and or socially unacceptable.

2004		Northstar ‘Ballin’ 🎵 Shit, I’m still hittin’ them ratchets.
2012		www.nappyafro.com 23 May 🌐 During my adolescent years [...] I learned a new word for ‘ho’. ‘Ratchet’ described my peers who participated in extra-curricular activities after school and on the weekends in backseats, someone’s mama’s bedroom, or in a movie theater.
2016		C. Eble (ed.) UNC-CH Campus Sl. Spring 2016 8: RATCHET — ignorant, trashy, lacking class: X: ‘I heard that girl got in a physical fight’ Y: ‘That makes sense—she’s ratchet’.
2017		D. Winslow The Force [ebook] ‘You smell like pussy, you motherfucker. White pussy, some ratchet?’.