A person who posts nothing but "TLDR" on everything within a forum. Usually referred to as a troll, but this is a more specialized case. TLDR is an acronym meaning "Too Long Didn't Read" and is used when you have no interest in reading a topic. Used to say basically that your thread, and you yourself certainly suck.
Soem Guy01 : "I collect tiny plaster figurines of kitties and I paint them in my garage. You know, funny thing about that garage..."
General public : Shut up.
TLDRian : TLDR