621

English

Etymology 1

From the numbers in the name of the website, itself possibly from E621 (the E number for monosodium glutamate when used as a flavor enhancer) as an indirect reference to the site’s content being tasty (“sexually appealing”). Compare the name of e621’s work-safe mirror website, e926, which matches E926 (E number for the bleaching agent chlorine dioxide), perhaps as a reference to figurative eye bleach.

Proper noun

621 (furry fandom)

1. e621.net, a chiefly pornographic furry booru digital art website.

   Synonym: (informal) e6

2. 21 June (abbreviated 6/21 in the United States), as an occasion to celebrate the website by posting yiff online.

Noun

621 (uncountable)

1. (chiefly furry fandom) A number associated with furries, the furry community or its culture; the furry number.

Etymology 2

Shortening.

Noun

621 (uncountable)

1. (informal, fandom slang, uncommon) The 6-2-1 rule.