ratty

Short definition from Wiktionary

Adjective

1. 1
   Resembling or characteristic of a rat; ratlike.
2. 2
   Infested with rats.
3. 3
   In poor condition or repair.
4. 4
   Crazy, mad; ridiculous; slightly strange, eccentric; also (followed by about, on, or over), attracted to, infatuated with.
5. 5
   Annoyed, bad-tempered, irritable.

Noun

1. 1
   Synonym of knock down ginger (“prank of knocking on a front door and running away”).