Discover the TLDR meaning and how to use it effectively in your writing. Read our guide to enhance your communication skills. TL;DR is an informal phrase that stands for "too long; didn't read." It's used to summarize or request a quick overview of a longer piece of content. Learn how to use it correctly and avoid misunderstandings. TLDR definition : 1. abbreviation for too long; didn't read: used to comment on something that someone has written…. Learn more. What does TL;DR mean ? Whether you've seen it on social media or in a text from a friend, here's what this helpful abbreviation means.