A person who is a expert of determining women's breast sizes. They also have a ability of telling if they are real,
fake and/or if they are using a
stuffed/pushed-up
bra/braless, all simply by looking, and WITH the woman being fully clothed.
Bob:
Wow, Judy really loves them think sweaters. I wonder what her bra size is.
Steve: *looks* She a 38C. And they're real. went with a brassier
today. Nice.
Bob: How the hell do you know that ?
Steve: I've got the mad skills
man. I'm a Boobieologist