What is the origin of calling "dibs"?

Google american slang dibs. Obscure history but commonly used…http://www.worldwidewords.org/qa/qa-dib1.htm

According to Cassell’s Dictionary of Slang (1998), “dibs” is a shortened version of “divvies,” from the Standard English “division” or “divide.” It might sound childish, but Dibs is serious business, with a complex set of rules. You can root out several rule books and Dibs registries online; also, Wikipedia has a few Dibs variations posted, including Eggs (or, as we called it as children, Negs, not Nigs), and Fives. :)

sort of like the origin of the word ‘bulldozer.’ It wasn’t at all what I thought it would be.