What is the move that girls do when they pop one hip and bend their knee?

The move you're describing is often referred to as a "hip pop" or "hip sway." It's a popular pose in dance and fashion, where a girl shifts her weight to one leg, pops out the hip on that side, and bends the opposite knee. This stance adds a playful and confident flair to photos or performances, highlighting curves and showcasing style. It's frequently seen in Music Videos and social media trends.