That means you have a new partner. Little Caesar.
7 seconds sound clip from the Little Caesar (1931) movie soundboard.
You can hear this line at 00:51:57 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, thanks, boys, for the artillery.
- Well, boys. What do you think of it?
- Scabby, you're in the wrong racket. It's perfect.
- That means you have a new partner. Little Caesar.
- Everybody'll laugh at Scabby's story.
- Gee, boss. You gave Arnie an awful walloping.
- Yeah. I ain't doing so bad in this business so far.
[...]