A person who excels in the art of cap. In other words someone who thrives in talking utter bullshit.
Friend 1: Is it really true that Rashkovsky was invisible in the GTA V prison break heist?
Friend 2: Yes he was compeltlely invisible...
Friend 3: Don't trust everything he says (Friend 1) he's a capologist.
A person who has smoked crack cocaine for many years, decades even. So much that they have made it a career to smoke rock. They are experts in the field of crack smoking.
That man who smoked crack for 20 years is so experienced that he's a crackologist.