621 en · PROPN · etymology 1
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.
Meanings
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(euphemistic, slang, sometimes) e621.net, a chiefly pornographic furry booru digital art website.
So, sorry, only website where all of them are put together is that 621 website (don't worry, its not an explicit comic)... Search Aoniya & Kaneinu's public bathhouse diary [Eng] and find the 621 post. You Will find all the comic there.
2026 January 31, u/PossessionKey4982, “furry_irl”, in r/furry_irl, Reddit, archived from the original on 24 May 2026:Is there a tag on 621 that describes this interaction and/or her emotional state? Or maybe a site/page that collects similar stuff? I want moar. Not even necessarily furry, if that's too rare.
2017 July 28, u/teodzero, “furry_irl”, in r/furry_irl, Reddit, archived from the original on 24 May 2026:Oh if only he knew what we'll do to him on 621
2024 December 14, @lancewereyenansfw.bsky.social, Bluesky, archived from the original on 24 May 2026:I managed to make a 621 account under the name willne because somehow that isn't taken
2020 December 29, u/ImpossiblePizza, “joke_irl”, in r/furry_irl, Reddit, archived from the original on 24 May 2026:Dude, you have to see the comments on 621 for this image. Literal essays being written.
2022 March 14, @zemi2357, “The most bangable alien design”, in Fur Affinity, archived from the original on 24 May 2026:
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(rare, slang) 21 June (abbreviated 6/21 in the United States), as an occasion to celebrate the website by posting furry-related pornography (yiff) online.
That's funny and it's almost 621 day. That would be a cool time to get some nsfw art of your character. If you want to do that
2025 June 5, @slushyfolf.bsky.social, Bluesky, archived from the original on 24 May 2026:Almost forgot to say it but happy 621 day! Funny how that also falls on the June Solstice lmao
2022 June 21, u/zeldatriforce345, “Day_irl”, in r/furry_irl, Reddit, archived from the original on 22 Jun 2022:Happy 621 everyone! What are some of your favorite tags?
2024 June 22, @auraad.bsky.social, Bluesky, archived from the original on 23 May 2026: