The definition of the word: Klazomaniac

Klazomaniac is a noun.

Klazo is a Greek word that means ‘to scream’. Klazomania refers to compulsive shouting, like in the disorder Tourette syndrome. It is a real condition but not much is known about it.

A klazomaniac is a person WHO CAN ONLY SPEAK BY SHOUTING. ALL CAPS = SHOUTING as you well know!

Klazomaniac - Klazomaniac

http://www.dictionary.com/slideshows/12-insults-we-should-bring-back#Klazomaniac

https://en.wikipedia.org/wiki/Klazomania