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Yiff in Hell” is a phrase used by those that oppose the furry fandom, directly aimed towards furries as a message to take the activities commonly associated with yiffing elsewhere

On 4chan, “Yiff in Hell” is typically found in Furry threads, used as a protest towards furries in an attempt to lower the amount of furry content posted on the site. While it has been seen spammed throughout threads in great numbers, certain self-identified furries have offered rebuttals stating that the argument doesn’t make sense

This is the proper meaning, rather then the "Other ones" trying to insult the Furry Fandom
Internet User: Yiff in hell furfag!
Furry: Does your swag raise money for charity?
by Another Goddamn Furry June 06, 2015
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The term used to insult furfags.
This insult will usually send the targeted furfag into a frenzy during which he (there are no women in the furry fandom) will go batshit insane and usually call you a redneck or a nazi.
Sane human being: Yiff in hell, furfag.
Furfag: shut upz u rednek natsi riterd!
by I am the spy September 27, 2009
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