edgelord

noun

edge·​lord ˈej-ˌlȯrd 

plural edgelords

slang

: someone who makes wildly dark and exaggerated statements (as on an internet forum) with the intent of shocking others

… his posts contain all the hallmarks of an "edgelord"—an internet poster who intentionally uses shocking ideas, language or images for the purpose of stirring up controversy or upsetting people's feelings.

—Newstex Blogs: The Wrap

Word History

Etymology

edge entry 1 + lord entry 1

First Known Use

2015, in the meaning defined above