TL;DR

Shorthand for "too long; didn't read," TL;DR or TLDR is used as a response to another user's post when it is unreasonably long (often greater than three paragraphs). Unless the forum or online community is dedicated to short stories, forum etiquette states that users should keep their posts as short as possible.

TLDR may also be used to introduce a synopsis of a longer post, as a tongue-in-cheek way to say "If you don't want to read this." For example, "TL;DR: The next twenty paragraphs outline in depth my philosophy about world politics."

Block of text, Computer slang, Forum, Internet terms, TL;DW, TMI