(adj) Describing an object, person, or situation that is
ill-formed, damaged, or
just plain messed up.
Likely from "premature" + "mutated".
First known occurrence in common parlance: January 1987,
Atlanta, GA.
"
Don't be smokin' crack and drinkin' 'cause you'll have them prematated
babies."
"I can't believe she's wearing the dress that her mother made to
prom--it's totally prematated."
"She was really kind of pretty until she got that botched facelift, and now she looks all prematated."