I've googled the lyrics to it (and I've even made a meme about it before - where Grumpy Cat says "no" to Adele when she asks to meet), so I'm definitely aware of the song. But I don't remember ever actually hearing it. I don't listen to the radio and I rarely click youtube links, and nobody has ever sung it to me. I know some of what the words are, but I don't know what it sounds like.
2 ups, 5y,
Well that's kinda weird, it's not too weird that you know some of the lyrics without listening to it, but I think it's weird that you haven't heard it before. This song is everywhere lol.