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TLDR

Quick Definition

This is an acronym for "Too long; didn't read."

When someone posts a huge wall of text on a forum or chat, they may summarize their comment by saying something to the effect of "The TLDR version of what I'm saying is..."

Alternatively, this is a response to a wall of text, where the commenter is simply going to dismiss the entire thing because they can't be bothered to read it.