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1.
Someone who studies and specializes in the male organ.
A doctor that checks up on the testicles and has to look at someone's dick for eg diseases (STD's), or misshapes.

A plastic surgeon that specializes in operations to the male organ.
"Man, I had sex with this woman, and now I start to have a rash on my penis."

"Visit the Dickologist".

"My penis is too small; I can't pleasure my wife"
"I heard the dickologist at 49th street can lengthen it with a small surgery".
by fukaface! December 15, 2010
 
2.
One who knows and understands the dick and is able to treat the dick EXACTLY as it desires to be treated.

One who gives good/great/amazing head.

The mistress of blowjobs!
Art: So, how's the head?
Sam: That bitch is a dickologist!
by n2funsd February 03, 2010