A dolly could also be used for the same purpose, but this implement had several legs radiating from a wooden disc (looking rather like a small stool), and the long handle had a handle-bar arrangement at the top for maximum leverage.
A person exhibiting foolish or flighty behavior might be likened to a posser-head.
Hey, I know you, I was at your posser last year!
No parents?!? Guy have a posser!