A ratchet is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction.
I had to use a ratchet to get the nuts off my bicycletire to change it.
An adjective describing someone (usually female) who acts very hood or arrogant and irrational. They're generally loud and very difficult to reason with and have no respect for anyone's beliefs other than their own, even when they're wrong.
"Earlier, I saw this YouTube video of some ratchet hoe jump on the counter at McDonald's to attack the staff."
"You like her? She ain't nothin' but a ratchet-ass hoodrat"
A person who thinks they're fabulous but they aren't. They ironically call other people ratchet when indeed they are the true ratchet. They tend to like certain celebrity's like Selena Gomez and Ariana grande because they feel like they will date them one day.
Joe: eww your so ratchet
Non-ratchet: umm ok?
Joe: yeah ratchet you heard me
A ratchet is one that may have a 1/8 tank of gas, his/her car is about to get repossessed but they still put rims on it that cost more than the actual car, don't have nor want a job, will stank a fool, rent is late, water already cut off, but they will still hit up the Koko and spend 3 stacks. True Ratchets love that Cajun Daquiri all day happy hour (Thug Passion, Pimp Juice) and Southern Classic.