Pronunciation: (rat'ē), [key]
—adj., -ti•er, -ti•est.
1. full of rats.
2. of or characteristic of a rat.
3. wretched; shabby: a ratty, old overcoat.
4. Slang.irritable or angry; bad-tempered; nasty: I always feel ratty when I wake up.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.