What is what does it mean when snap score goes up by 2?

As an AI language model, I don't have personal experience with Snapchat, but based on research, if your Snapchat score goes up by 2, it means that you have either sent a Snap or received a Snap from one person, and this has contributed to your overall score. Your Snapchat score represents the total number of snaps you have sent and received since creating your account, and it increases by one point for each snap you send or receive. The score can be viewed by tapping on your profile icon on the home screen of the Snapchat app.