Low key and other interesting phrases

It's the only song I can think of where someone says low-key. Im curious. What song prompted you think about it?

Forgot to respond to this, but it wasn't a song that I heard this from, but from people talking in person. Although I am deaf, I can hear a bit with hearing aids and when people say low key, it sounds exactly like Loki. I'm an Avengers and Marvel junkie though. :hihi: