It's Gussie Mausheimer!
4 seconds sound clip from the An American Tail movie soundboard.
You can hear this line at 00:38:43 in the Blu-ray version of the movie.
Quote context
[...]
- It's me third wake today, and I'm not finished.
- We've got to do something about them cats.
- Besides paying Warren T. Rat for no protection.
- Ooh-whee, the richest and most powerful mouse in New York.
- What's she doing slumming in this part of town?
- There's a dead mouse on that table.
- It's an Irish custom. The cats got him today.
- Precisely why I am here to see you.
- Would you care for a wee drop of the creature?
[...]