In the context of Instagram, "CC" does not have a specific meaning or abbreviation. It's possible that "CC" is being used as a shorthand or abbreviation for something specific within a particular conversation or context. However, it's important to note that the common usage of "CC" in other contexts typically stands for "Carbon Copy" and refers to the practice of including additional recipients on an email or message.
If you can provide more information about the specific context in which "CC" is being used on Instagram, I may be able to provide a more accurate explanation.