adjective, rattier, rattiest.
full of rats.
of or characteristic of a rat.
wretched; shabby: a ratty, old overcoat.
Slang. irritable or angry; bad-tempered; nasty: I always feel ratty when I wake up.

1860–65; rat + -y1

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World English Dictionary
ratty (ˈrætɪ)
adj , -tier, -tiest
1.  informal (Brit), (NZ) irritable; annoyed
2.  informal (of the hair) unkempt or greasy
3.  slang (US), (Canadian) shabby; dilapidated
4.  slang (Austral)
 a.  angry
 b.  mad
5.  of, like, or full of rats

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
More than often, this rather selfish debate seems to take an hour or more,
  which makes me pretty ratty by the morning.
My ratty old toy box was animated into a rectangular troll that had eaten all
  of my favorite possessions.
The office was in a ratty downtown building above a magic shop.
There were always a couple of these sounding sticks kicking around in the ratty
  sub-cushion regions of a flivver.
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