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"