What Does This Mean?
An alternative spelling of tl;dr, the internet shorthand for "too long, did not read", used to flag a text as too long or to introduce a short summary. The added letter makes the negative explicit.
EXPLAINER

ADictionary · original source ↗
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REAL-WORLD EXAMPLE
""TLDNR: the thread is forty replies about parking.""
LORE & ORIGIN
Wiktionary lists TLDNR as an alternative spelling of tl;dr, expanding to too long, did not read, and links the forms TL/DNR and TL-DNR. Wikipedia dates tl;dr itself to at least 2002, citing the Oxford English Dictionary; no dated source for the TLDNR spelling was found.
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