Navy Seal Copypasta (also known as the “Marine Copypasta”, "Internet Tough Guy Copypasta” and “Gorilla Warfare Copypasta”) is a facetious message containing a series of ridiculous claims and grandiose threats that portray the poster as an Internet tough guy stereotype. In the original post, the writer claimed to be a former Navy Seal with a long history of combat experiences, using comical typos and hyperboles like “Gorilla Warfare,” “300 Confirmed Kills” and “I can kill you in over 700 ways with just my bare hands.” Since its emergence in mid-2012, the copypasta has spawned a variety of spin-off stories, similar to the John Copypasta meme.

https://knowyourmeme.com/memes/navy-seal-copypasta