1) (noun) Sound supposedly made by mating arctic foxes.
2) (acronym) (or more backronym) YIFF or Y. I. F. F. - "Young Incredibly Fuckable Furry"
3) (proper name) YIFF sound server. Program for Linux to help handle audio.
4) (noun) More or less (usually more) sexual act. Commonly used by furries, usually denotes standard intercourse but may denote any kind of sexual behaviour between any type and number of parties (imaginary anthro creatures, humans, animals, even inanimate objects like plushies). Antonym: Yerf.
5) (verb) Like in meaning 4, "to yiff".
6) Furry (or otherwise) artwork depicting yiff as in meaning 4.
7) Expression of joy (by furries)
8) Non-invasive question about sexual feelings/will to mate.

Note in all sexual meanings this has a very specific emotional background: It's neither considered vulgar (like "fuck" or technical (like "have intercourse") or emotion-less (like "make love"). It's playful, considering the act like something fun, nice, pleasant and not very important - without any special obligations attached to it. "Let's yiff" has about the same emotional background as "Let's play".

See also yiffy
1) I heard foxes making the "yiff" noises.
2) He's a Y.I.F.F.
3) I've upgraded the yiff server.
4) Are you into yiff, or just cuddles?
5) Let's yiff.
6) It's hard to find good yiff on VCL nowadays.
7) I did it! Yiff-yiff-yiff-yiff-yiff!
8) "Yiff?" "No, thanks, I don't quite feel like this right now."
by SharpFang August 20, 2003
a yell and a sniff combined; a yiff.

it was created by stephanie from GTlive during a let's play of the game dayshift at freddy's, when she claimed that a yiff was a yell and a sniff at the same time, even though she did not know what it actually meant at the time. other definitions under this word will most likely explain the original definition.
"don't yiff the fox"
"yiffing the fox is prohibited"

"the fox was yiffed"
by inkx0c January 30, 2022
Drawn porn featuring furry characters. Extremely repulsive and disturbing to some, exciting and alluring to others. Animalistic traits refined by evolution serve to compliment conventional human sexiness (expressed in body shapes, facial expressions, situational context and etc.) resulting in wild variety of lustful self-expression. All genders, sexualities, fetishes and species are present, once you're hooked you'll have a lot to choose from.
Being attracted to yiff typically doesn't mean being a zoophile since most of such art features humanlike bodies and stylized muzzles expressing human emotions. That said, there's also such thing as feral yiff.
Lots of people make money drawing yiff comissions but there are also a lot of artists creating such art just for the sake of it. Measuring the sheer volume of yiff content produced daily is currently impossible.
Alex: my yiff fantasy is that my jackal fursona is caught between a female fox and a male wolf. She's foxily slender and has nice hips & tits, he's much more muscular than me and also larger. We're kissing and touching each other, then she lies on her back and I start entering her just as the wolf guy penetrates me while growling in my ear... shit, that's awesome, why can't I draw? Guess I'll commission it.

Some people think yiff signifies our species' growing interest in transhumanism.
by Siberian Lynx June 15, 2019
1. A happy affirmation in an imaginary fox language, invented by the writer of the Fuzzball MUCK server. The definition was confused with the definition for another word in the same imaginary language, 'yipp', and an administrator of another MUCK heavily promoted 'yiff' word in its first known sexual connotation in 1995 or later. It was only after this point that supposed origins concerning mating sounds and acronyms were invented.

2. Meant to imply feelings of sexual arousal or intent to arouse; also refers to a sexual act. Considered crass language in polite circles.
1. "Yiff!" (Happy affirmation in imaginary foxish language.)
2. "Yiff!" (I am feeling aroused.)
by nobody in particular July 23, 2004
Yiff is the hottest type of porn because it is furries having sex
hey do you watch yiff
Hell no!
Are you sure
No im not sure, its hot
by Isaac torrent walker December 24, 2017
It stands for, Yucky Idiotic Furry Fuckers. Y.I.F.F.
All furries are yiff.
by Ryan Satter March 22, 2005
a form of pornography of the furry nature
in which one or more anthropomorphic
animal character(s) is doing something
sexually to another anthropomorphic animal
furry. there are sites such as furaffinity.net
and yiffstar.com where there is a large
selection of yiff(y) stories and pics done
profesionally and amature arts.
(furry 1)wanna yiff?

(furry 2) depends on if you are good at rp

(furry 1) im good if you want me to be *winks*

(furry 2) then lets fuck
by blood wolf May 28, 2009