What is a yo yo?

A yo-yo is a wooden spool - like toy that is reeled up and down with a string. A person can do many tricks with it for example: Rock the cradle, Walk the dog etc.

It is a toy.
Its like to sides of a ball with a bar through it and string!!! yea that and a ride found mostly at the sussex county fair in sussex nj. and probably other places too.