Can you help me understand this example of guy talk?

Here’s a bit of socio-linguistic detective work for you jellies.

As I was riding to work, I passed a guy on the sidewalk who was saying to another passing bicyclist, ”‘Bama sure did a number on them last night, didn’t they?”

On the face of it, this is a simple, “yes” question. There is no other possible answer. But if that is the case, then what is the point of the question? Is it just to fill space? Make noise? What?

What is (are) the (possible) meaning(s) of this phrase?

What would be an appropriate answer?