Not the original poster, but to me it usually refers to a language that is expressive and high-level but usually not fast or efficient enough to implement the actual heavy lifting. It seems fair to call Python a scripting language. This is not a derogatory term, rather it actually describes a great way to build software and explains Python's success.

Probably something along the lines of "something I don't like, but don't have any objective reasons to prove why it is bad".

To me, it means that the person who wrote "scripting language" probably doesn't know what they're talking about.