yiff

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

plural yiffs

1. informalslanguncountableusuallyThe bark of a fox.
2. informalslanguncountableusuallyvulgarSexual 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. informalslanguncountableusuallyPornography of or involving furries.

   Do you draw yiff?

present singular third person yiffs · participle present yiffing · participle past yiffed · past yiffed

1. informalintransitiveslangTo bark as or similar to a fox.
2. ambitransitiveinformalrarevulgarOf animals, especially foxes, to mate

   Well, i’ve witnessed male foxes queueing up to yiff one of my local vixens… repeatedly!

   1997 September 23, MegaDog the Nettweiler, “Hypothetical Question #3: acting natural”, in alt.lifestyle.furry (Usenet), message-ID <1d3DsMAQZ$J0Ew2R@canismajor.demon.co.uk>

   2 more examples

   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. ambitransitiveinformalslangvulgarOf furries, To have sexual intercourse.

   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

   1 more example

   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

4. informalintransitiveslangtransitiveTo propose cybersex to someone.