"Not Cool" follows previous singles "Sorry Mister", "Weirdo Magnet", "Killing It", "TGIF" and "Calvin Klein" as an early cut from the duo, combining inspiration from sources ranging from The Strokes to Candy Crush.

"'Not Cool' is a song inspired by an ex boyfriend," they explain. "We’ll let you decide if he’s cool or not. It’s also the first song we ever wrote as Disgusting Sisters, so it means a lot to us as it feels like the beginning of everything."