ratty

adjective, rat·ti·er, rat·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.

adjective -tier or -tiest

1. British and NZ informal irritable; annoyed
2. informal (of the hair) unkempt or greasy
3. US and Canadian slang shabby; dilapidated
4. Australian slang
   1. angry
   2. mad
5. of, like, or full of rats