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Tldr
TL;DR, short for “too long; didn’t read”, is Internet slang to say that some text being replied to has been ignored because of its length. In slang it can also stand for “Too lazy; didn’t read”. It is also used as a signifier for a summary of an online post or news article.The phrase dates back to at least 2003, and was added to the Oxford Dictionaries Online in 2013.
Wikipedia