What Does This Mean?
"Too long; didn't read" — a prefix or suffix added to a long post to flag a condensed summary for readers who won't read the whole thing, now standard shorthand across forums, workplaces, and ordinary writing.
EXPLAINER

Digiday · original source ↗
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REAL-WORLD EXAMPLE
"TL;DR: the plan changed, meet at the other location instead."
LORE & ORIGIN
Forum shorthand tracked back to at least 2003 across early web communities like Something Awful and FARK, one of the oldest surviving pieces of internet acronym vocabulary.
EQUIVALENT CONCEPTS IN OTHER LANGUAGES
MENTIONS OVER TIME
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WHEN DID YOU FIRST HEAR THIS?
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