It’s this advert. It’s on the kids’ channels a lot and, embarrassed as I am to admit it, I quite like the song. It also gets stuck in my head.
Online all I can find is other people asking who the song’s by and some people explaining the lyrics: apparently they’re I am in Geox, you are in Geox,’ not ‘I am a Jew, you are a Jew,’ as many people have misheard. 
I didn’t mishear it that way - I couldn’t figure out what they were saying at all.