Acronym for "Too stupid; can't read". When someone spends time and energy writing an epic explanation for something, only to get a response of "TL;DR" (see "TL;DR"), you can fire back with this one.
Tax payer: "... and in conclusion, I restate that it is the utmost importance to have this bill passed through congress. Thank you."
Congress: "TL;DR. We never read these bills."
Tax payer: "...don't you mean 'TS;CR'? I mean, you are a politician after all..."