one who studies donk (badonkadonk, booty, etc) and determines whether a girl has a certified donk
Courtney: See, I DO have a donk!
Rachel: Really? Your butt's not that big...
Courtney: My donkologist certified it and said, "Its not how big the booty is, it's what you do with it."
Bekah: DAYYYUMMM SHE GOT A DONK!