Martial Autist 

An evolved form that a high functioning autistic person obtains when they are shown TMNT, Naruto, Kung Fu Panda, or Dragon Ball.
After learning the combat style of which ever cartoon/anime they were shown, they will immediately go and beat the shit out of all the school bullies.

Martial Autists are extremely deadly, armed or unarmed. You'll be much better off avoiding any fights with them

Martial Autist by Pokedex #184 February 3, 2020

Backseat martial artist 

Someone who doesn't actually practice a martial art of any sort, but loves to comment on them like their an expert. Quite similar in concept to that of a backseat driver. They tend to obtain most of their martial knowledge from internet video clips, free TV airings of fights, and sometimes they might even spring for a pay-per view match. A common favorite move of the backseat martial artists to try and perform is the armbar, which they typically learn from watching old clips of Royce Gracie and not from an actual dojo.

Once only staunch supporters of BJJ, they have now decided to extend some of their divine credibility to that of Muay Thai.

Person: What kind of kung fu should I take?
Backseat Martial Artist: Take BJJ

BMA2: Grappling is the most effective form of fighting, therefore you should definitely try to use it against multiple opponents.

BMA3: That won't work in real life, trust me I know

BMA4: Well in a real fight............... *5 paragraphs of bad spelling later*.... and thats why you should take BJJ

Backseat martial artist by Lee Gin Jet April 24, 2008

Armchair Martial Artist

One who loves to view the grace, beauty and dedication of the physical accomplishments of Eastern or Western combat arts, without being bothered to actually do any of it, yet still knowing a great deal on the subject.
Could possibly be called a Partial Artist or Chair Boxer.
Someone who enjoys others who fight while they sit, one who has mastered Bum Fu.
A lazy Fight Fan.

Bloke 1: Your mate knows alot about martial arts, girl...
Lady 1:Oh, dude, he's an Armchair Martial Artist who has mastered Bum Fu.

Armchair Martial Artist by Snowcaller December 3, 2013

Martial Artist 

Someone that trains self-defense, in order to defend themselves or others.

"He just kicked a robber in a head! What a martial artist!"

Martial Artist by QwertySherty October 4, 2019

Marital Artist

(not to be confused with Martial Artist): A special type of Marital Counselor who shows married couples not only how to stay married, but, how to have an extremely happy marriage.

Barbara claims to be a Marital Artist, but, she fucked Eileen's husband!

Marital Artist by Joseph Selb March 12, 2009