1: To act in a dysfunctional or out-of-pocket manner; unruly; 2: Someone whose actions could be considered as severely undistinguishable; possesing little or no class.
"I'm tired of Denise bringin' them ratchet ass kids around the house when I'm trynna work! Little heathens always trynna tear shit up!"

"Ayy yo tell me why this bitch is down to let the whole team smash?!?"
"Cause she ratchet..."
by Mr.Bornfly22 December 17, 2012
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1) A ratchet is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Though something of a misnomer, "ratchet" is also often used to refer to ratcheting socket wrenches, a common tool with a ratcheting handle.

2) A character in the Transformers franchise. (Seriously?)
1) There is a ratchet in that clock. That means that the clock can't turn the opposite direction...

2) Ratchet can turn into an ambulance at will.
by Anon255 February 08, 2013
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a galactic space lombax that has saved over 50 galaxies along with a robot named Clank.
Gamer 1: Ratchet is one of the universe's greatest heroes that has been known by all kinds of alien races!

Gamer 2: But didn't Clank also help him?

Gamer 1: Yeah, he met him while fixing his ship.
by SuperDooperPooperScooper November 13, 2013
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One of the most epic Transformers, he is yellow-ish and pretty much the brains of Optimus Prime's group.
Optimus Prime: Our medical officer: Ratchet.
Ratchet: The boy's pheromone levels suggest he wants to mate with the female.
by TransformersChick July 26, 2009
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a tasteless, classless individual (most often a female) who does vile and off color things on a frequent basis while still maintaining diva status in her own mind.
Context: In the workplace-

Girl One: "I was waxing my butthole."
Girl Two: "Damn! Didn't that burn?"
Supervisor: "Ya'll are ratchet! Get back to work!"
by WorkConductPolice February 05, 2013
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A term ghetto people use to describe other ghetto people.
Ghetto girl one: I can see yo coochie hanging out your shorts, you ratchet.
Ghetto girl two: Says the girl who sucks dick for food stamps!! YOU ratchet.
by I hate Swag fags May 29, 2013
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