Cockoisseur 

noun
1.
a person who is especially competent to pass critical judgments about cocks (as in dicks), particularly about size, length, girth, shape, "angle of the dangle", circumcision, or lack thereof.
a connoisseur of cocks.

A prostitute could be considered a cockoisseur since her main job function involves cocks.
A urologist could also be considered a cockoisseur.

Cockoisseur by funnydanigirl May 27, 2018

Mixology Connoisseur 

a person who is especially competent to pass critical judgments on the art of making drinks

Author Storm DuBois created the term Mixology Connoisseur referring to being a expert in the art of drink making

Mixology Connoisseur by J.P jackson March 23, 2010

Cock connoisseur 

An individual who travels the land far and wide, tasting all varieties of human penis, subsequently rating and favouring them, possibly producing some form of TV show or journal in the process.

Now on BBC Two, David Attenborough: Cock connoisseur.

Cock connoisseur by Kieran and Michael February 11, 2009

turd connoisseur 

An expert judge in matters relating to the taste and texture of turds, usually a canine but sometimes a person.

A long time ago I had this toy poodle who was a total turd connoisseur, she would seek out turds wherever she could find them and she was lucky enough to be living with some fine cats who left her little brown love bombs in their cat box.

turd connoisseur by Dr Bunnygirl October 16, 2019

Pussy connoisseur 

A person that has seen pussy for days, knows everything and anything about pussy. Simply a expert at pussy.

"Fargo aint't no rookie that boi a pussy connoisseur" Argentina Fargo

Pussy connoisseur by xXPardyM4NXx October 10, 2016

Cannabis Connoisseur 

A Cannabis Connoisseur is an individual with a vast knowledge in anything related with Cannabis. This individual can tell you everything there is to know about cannabis. From the name of the strain to the flavor and the type of highs. He can identify Indicas from Sativas, and anything in between. He can also give you a list of recipes that include cannabis.

Mundo: "So what kind of bud do you have today man?"

Larry: "Oh, I got some New York City Sour Diesel. Man, this one is bomb. Just look at the soft green color on this, and all the tri-combs. It has a strong scent, smells kind of dank. The texture is just perfect, it's soft, spongy, and it's soo sticky. The high on this strain is killer! Compared to that Afghani Kush, this one kills it."

Mundo: "Damn, you're a total cannabis connoisseur."

For another more visual example watch the film "Pinneaple Express". The scene where Seth Rogen goes to buy weed and James Franco describes the different types and tries to go in deepth with all the details. James comes off as a total Cannabis Connoisseur.

Cannabis cultureCannbiphileCannabisPothead

Cannabis Connoisseur by CrazyMundo February 25, 2009

Cleavage Connoisseur

A person who is knowledgeable about the human female breast, and appreciates them, not only for their function and purpose in human anatomy and physiology, but for their aesthetic value which is judged primarily on form and authenticity.

I don’t ogle women, I’m a Cleavage Connoisseur.

Cleavage Connoisseur by G.Wally October 23, 2008