The story
After George F. McQuary, a frequent contributor to the newsgroup alt.fan.warlord where flamboyant signatures were criticized.
First known use, by meaning
- from 1992 The rule of netiquette stating that the text of a Usenet signature, or sig, should be less than 80 columns wide and no longer than four lines.
Etymology from Wiktionary, CC BY-SA 4.0.