1. A type of tool
2. A female "wannabe"
3. A person (usually female) who thinks she is cool, but she is not.
4. A derogatory term to describe a female who thinks she is young, thin, fashionable, or intelligent but who is not.
Origin: An ebonic vernacular term coined from the word "wretched." Origin: Made popular by rapper Lil' Boosie in his song "Ratchet" whose subject is the poor and wretched. The term has been picked up by the mainstream teenage culture.
"She thinks her clothes make her hot, but she's ratchet."
"Mom, dating that guy my age is just ratchet." e.g. from "Girlfriends' Guide to Divorce"
"Look at that ratchet with the bad hairdo and torn fishnets sucking up to the guy in the Porsche. That's just ratchet."
Optimus Prime "My Medical Officer, Ratchet." Ratchet "Hmm, the boys pheromone level suggests he wants to mate with the female." Transformers 1, when the other autobots arrive.