yiff saksaksi - Sanakirja.org (englanti-saksa)

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

(slang, informal) The bark of a fox.
(slang, vulgar, informal) Sexual intercourse, especially between furries (fictional anthropomorphic animal characters or members of the community surrounding their celebration).
(slang, informal) Pornography of or involving furries.

(intransitive, slang, informal) To bark as or similar to a fox.
(ambitransitive, rare, vulgar, informal) Of animals, especially foxes, to mate
(ambitransitive, slang, vulgar, informal) Of furries, To have sexual intercourse.
(intransitive, transitive, slang, informal) To propose cybersex to someone.

Of course the inverse is possible with all these possibilities, and you can be having a yiff with a partner in the room with you and be having a pleasant non-sexual conversation with another remote player through a page-conversation.
Do you draw yiff?
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’.
And even if foxes are allowed to yiff more than once, I’d still have to wait for the vixen to come into heat.
Well, i’ve witnessed male foxes queueing up to yiff one of my local vixens… repeatedly!

Partisiipin perfekti	yiffed
Imperfekti	yiffed
Partisiipin preesens	yiffing
Monikko	yiffs
Yksikön kolmannen persoonan indikatiivin preesens	yiffs

Sanakirja.org