Etymology

t.

Today it means: Used as a way of signing off posts. Typically followed by an occupation, nationality, or field of expertise. These can sometimes be satirical, to imply said poster is being disingenuous and/or tongue-in-cheek. Full definition →

Finnish t.
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The story

  1. Finnish · borrowed fromt.
  2. English todayt.

Borrowed from Finnish t., abbreviation of terveisin (“regards”). Originally started on the Finnish imageboard Ylilauta; popularity and ironic usage outside the nation is linked to Finnish-origin memes such as "Spurdo Spärde".

Etymology from Wiktionary, CC BY-SA 4.0.