yiff

Interjection

1. Onomatopeia representing the bark of a fox (especially while mating).
2. (informal) Used to express happiness or to state that something is sexually appealing.

Noun

yiff (usually uncountable, plural yiffs)

1. (informal, slang, usually) The bark of a fox.
2. (informal, slang, usually, vulgar) Sexual intercourse, especially between furries (fictional anthropomorphic animal characters or members of the community surrounding their celebration).
   • FurryMuck yiffs are like real-life yiffs - there is a time and place for everything.1996 July 14, j.serdy, “RFC: A Beginner's Guide to TinySex on the FurryMuck”, in alt.fan.furry (Usenet)
3. (informal, slang, usually) Pornography of or involving furries.
   • Do you draw yiff?

Verb

yiff (third-person singular simple present yiffs, present participle yiffing, simple past and past participle yiffed)

1. (informal, intransitive, slang) To bark as or similar to a fox.
2. (ambitransitive, informal, rare, vulgar) Of animals, especially foxes, to mate
   • Monsters snicker at me, succubi refuse to be seen with me, my dog tries to yiff my leg, shopkeepers say ‘No shirt, no shoes, no service’.1997 October 17, StarChaser, “What to genocide”, in rec.games.roguelike.nethack (Usenet), message-ID <3448af39.75668367@169.132.11.13>
   • And even if foxes are allowed to yiff more than once, I’d still have to wait for the vixen to come into heat.1997 September 22, Locandez, “Hypothetical Question #3: acting natural”, in alt.lifestyle.furry (Usenet), message-ID <na.dab87347cd.a40040lyndale@argonet.co.uk>
3. (ambitransitive, informal, slang, vulgar) Of furries, To have sexual intercourse.
   • I mean, the urge to yiff is a pretty weird thing to admit to. Not something you can just drop into conversation. But look at them, hundreds of them, all gathered together in a Vegas hotel, exchanging information and experiences, the knowledge of their rare urges ever growing.2012, Joanne Reay, Romeo Spikes
   • We can tell them how we never stop yiffing and we met at a Starbucks while wearing our suits.2017, Joe Strike, Furry Nation: The True Story of America's Most Misunderstood Subculture, →ISBN
4. (informal, intransitive, slang, transitive) To propose cybersex to someone.