I don't know but I'll bet it was "Happy". AmIrightamIright?
You're on the cusp. In the not too distant future, you'll find that you become sort of invisible to younger people, especially the women.
I'm well aware of Robin Thicke (worst name eva...) and Blurred Lines and the twerking, but have never heard the song. Deliberately.
I keep across popular culture, I just choose not to listen to most of it, as far as music goes anyway. If it's good, I'll find it eventually...
Heard of them all and im 47....