Granny was one of the firsts to chime in with what it was and then went on to tell me a basic explanation on how it works. Thank you, Granny.
I had to laugh at Cassie's guess, a hijinksamagubber! Following Dr. Suess's lead that if you don't know what something is, then make up something funny to name it. Funny indeed.
Anita did a little research and found one for sale on Etsy. This is a snippet of what the seller had to say about it.
"It consists of two 5.5 ft long slats, slotted and joined with metal hardware, which allows the back slat to be slid up to extend the height of the pole. An oval sliding target can be moved up and down the pole and is held with a metal clip."
I guess I have only half of a the measuring stick. According to the above description, the other slat would go on the top metal slide.
Now I want a target thingy for mine! Let's see, if I found the stick for a dollar, do you think I can find the target for 50 cents? Hmm.