So if you're at postion, and you change position, we call that velocity. If you change between two velocities we call that acceleration. If you learned this in school you would call these derivatives. Well when you take the derivative of acceleration, you get something called jerk. And the derivative of jerk is called jounce.

But jounce is a horrible name, so they started calling it "snap". Naturally this lead to the next two derivatives being called "crackle" and "pop".

These aren't the official names, but they don't have official names so "position, velocity, acceleration, jerk, snap, crackle, pop" is officially unofficial