Origin of the Word Dibs

I was curious about the origin of the word "dibs". I mean I have been saying it my whole life but am just now become curious about the word. The best two answers on the word origin are found

HERE

and

HERE (you have to scroll down)

The bottom line is - the experts aren't sure of the word's origin. It is a bit of a mystery. Kinda like why the Red Sox still give at bats to Kevin Millar.