What song do these notes represent? I've seen people suggest it's "Pop goes the weasel", but I can't confirm because I don't have the required musical reading skills
It is indeed Pop Goes the Weasel, but written quite irregularly.
I've filled in the end of the first line with what the tune normally is, but the second line is some sort of variation.
In the video below you can hear (and see) the visible tune from the screenshot.