Usually a black female, rachetness is being extremely loud and annoying.
Unlike a "hood" ratchets know better than to be disrespectful but they have no concern for other people.
For example "HeavenMason was filling the classroom with her rachetness today."
A disease that, when infected, victims lose control of their bodily functions including motor functions, much like a fictional zombie, and go into a fleeting, animal-like rage, until death. the virus acts very quickly and infects another victim before killing and feeding off of the previous victim.