-tl;drとは
--インターネットスラング
--Too long. Didn't read. の略
--文章が長過ぎて読まなかったという意味。転じて要約の意になる。
-tldrの意味・用例｜英辞郎 on the WEB：アルク
--https://eow.alc.co.jp/search?q=tldr
-->＝Too long. Didn't read.
-->長過ぎ。読みませんでした。／長文うざい（と言う人のための要約）
-TL;DR - Wikipedia
--https://en.wikipedia.org/wiki/TL;DR
-->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.