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Usually refers to cyber sex between two or more members of the furry fandom. Originally refers to the sound that foxes make when mating. Members of the furry fandom may use the term to refer to actual sexual contact, usually in a lighthearted manner.

It is also a term used at furcons to inquire about sexual intentions between fursuiters.
The anthro fox smiled at the mass of horny furres, knowing that a good yiffing session would soon follow.
by Suirel Whitedragon January 27, 2006
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2
Yiffing is a combination of words "sniff" and "yell" made up by MatPat's wife Steph in their livesteam for a game Dayshift at Freddy's, as she didn't know what it actually meant.
MatPat: "So, yiffing is, for those who don't know-"
Steph: "Wait, I should guess! I think that a yiff is probably a yell and a sniff at the same time."
by JJTrue October 30, 2016
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3
while dressed up in animal costumes, participants grope, fondle, and hump on each other for sexual gratification. no actual sex involved. Usually done in a group setting.
Peter "rabbit" and Jane "cat" fondled each other through their costumes while yiffing at a furry friends party.
by Icerook January 21, 2004
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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4
When grown ass men, who live with their mothers and own show cats, dress up in animal costumes and dry hump each other.
jon: "Hey Jimmy do you want to go yiff." Jimmy: No, I don't have time for yiffing. I have to go help mother clean the cat cages."
by H8ing you February 07, 2009
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Donkey Punch Plush

10" high plush doll.

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