What does it mean to pop lock and drop?

Popping, Locking and Dropping is a dance style that originated in the late 1960s in the United States. "Popping" involves rapidly contracting and relaxing specific muscles to produce a "popping" effect, while "locking" involves rapidly holding and releasing a position momentarily to create a "locked" effect. "Dropping" involves quickly moving down towards the ground with controlled movements. These techniques, and others based on them, are combined to produce a visually dynamic dance that is both energetic and fun to perform.