'out there' could have different meanings and it all depends on the context you are using it. In the sentence above it must mean a pre-decided location, the person is referring to, where you are supposed to meet him/her.
More ways of using 'out there'
1. It is not safe out there.
2. There is way too much competition out there.
3. The truth is out there.
4. Does anyone out there know how to solve this sum?
5. Out there is the most dense jungle I have ever seen.
6. You be careful out there!
7. Who's out there?