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621
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English
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Etymology
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From the numbers in the name of the website.
Proper noun
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621
(
furry
fandom
slang
)
e621.net, a chiefly
pornographic
furry
booru
digital art
website.
21 June
(
abbreviated 6/21 in the United States
)
, as an occasion to
celebrate
the website by posting
yiff
online.