Human: I've always wondered why it's called a "pogo stick" when it's really a "jumping stick." Can you clear that up for me? Assistant: 
Pogo is an acronym for the phrase “push-pull-gravity oscillation” which describes how the pogo stick works. The term “pogo stick” comes from the fact that the user can move their feet back and forth to cause the stick to bounce up and down in a vertical motion.