Colloquial Variant guide

621

name · noun · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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No pronunciation record was provided for this word.

1

name

Meaning 1

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

Definition source: English Wiktionary via Wiktextract

Usage: euphemistic, slang, sometimes

Topics: lifestyle

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: e6

Antonyms: none provided

2

name

Meaning 2

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

Definition source: English Wiktionary via Wiktextract

Usage: rare, slang

Topics: lifestyle

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

The 6-2-1 rule.

Definition source: English Wiktionary via Wiktextract

Usage: informal, rare, slang, uncountable

Topics: lifestyle

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

The website name is a clipping of e621, using only the numbers in the name of the website. The website itself is from E621 (the E number for monosodium glutamate when used as a flavor enhancer) as an indirect reference to the service'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. The day is a direct reference to the website and based on 6/21, an abbreviation in the United States for 21 June.

A shortening.