It was a joke.
5 seconds sound clip from the Teenage Mutant Ninja Turtles (1990) movie soundboard.
You can hear this line at 00:26:43 in the Blu-ray version of the movie.
Quote context
[...]
- Mmm. You dirty rat. You killed my brother. You dirty rat. Mmm.
- That must be Splinter's favorite. Ha-ha-ha.
- And speaking of which, we better get going. He worries.
- Oh. Well, I don't know what to say.
- Will I ever see you guys again?
- That depends on how fast you stock your pizza.
[...]