It's a rotgut room. A holdover from Prohibition.
5 seconds sound clip from the Who Framed Roger Rabbit movie soundboard.
You can hear this line at 00:44:11 in the Blu-ray version of the movie.
Quote context
[...]
- Cut the comedy, Dolores. I've had a very hard day.
- I gotta get out of these cuffs.
- Whew! Jeepers, Eddie, that almost killed me!
- Boy, what is this? Some kind of a secret room?
- It's a rotgut room. A holdover from Prohibition.
- Oh, I get it. A speakeasy, a gin mill, a hooch parlor.
- Look at this! It's a spy hole!
- Jeepers, Eddie! This would be a great place to hide!
[...]