That means he doesn't know.
2 seconds sound clip from the The Pebble and the Penguin movie soundboard.
You can hear this line at 00:21:12.078 in the Blu-ray version of the movie.
Quote context
[...]
- What are you staring at, birdbrain?
- That's Hubie, and he's heartbroken.
- Yes. He was snatched away from the lady he loves.
- Poor, poor pebblehead. If he had any guts, he never would've let them take him alive.
- So, where is this floating scrapheap headed, anyway?
- Our destination would be difficult to determine at this juncture.
- I know where we are. Where do we dock? That's what I'm asking. Where do we dock?
- We can't say for sure, lad, but I've heard stories of sailors selling penguins to zoos.
- Zoos? I'm not going to no zoo. No, no.
[...]
