jargoner

Example:He is a true jargon expert in the field of medicine.

Definition:Someone who is skilled in understanding and using the specialized language of a particular field. Used when referring to someone knowledgeable in the technical language of their profession.

Example:She's a slang specialist in hip-hop culture.

Definition:A person who studies or uses slang and informal terms. Often used when discussing those who are adept at using colloquial speech in their professional circles.