yiffin 

Yiffin is the definition of furry sex

Furry1: want to yiff?

furry2: sure lol

Yiffin

yiffin by nigatron3001 June 8, 2019

yiffniff 

"the word" for the 2007 FCAT that nobody can spell. Everyone is beginning to know about that word and seeing who can spell it which is now yet known

my cousin keith tried to spell yiffniff but he got it wrong so my dad sent him to hell

yiffniff by the king of hialeah February 27, 2007

yiffing 

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."

yiffing by JJTrue October 30, 2016

yiffing 

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.

yiffing by Suirel Whitedragon July 16, 2008

Yiffany

A ship name between yun and tiffany. They both like each other extremely and their love will go on.

yiffany is amazing!!

Yiffany by xx.banana.xx October 21, 2019

YAFFing 

YAFFing, or, the act of writing You're a Fuckin' Faggot Dude or (YAFFD) is an acronym used in texting, usually when texting between two guys, that is usually a response to a male friend using an emoticon (smiley face or any other kind of face). YAFFD is intended to let the person know that you only tolerate broads who use that shit because they have vaginas and tits that they may one day expose to you.

YAFFING Example:

Steve (Texting Bill): dude, tonight we should totally go and see the new Judd Apatow movie
Bill: Sounds good. I'll call you when I get off work.
Steve: :o)
Bill: YAFFD
Steve: why'd you YAFF me?
Bill: because you sent me a gay clown face in your text. only girls who have nice big goobler tits are allowed to make those. Seeing as how you don't have the aforementioned goobler tits, I refuse to stand for your texts, as you are a faggot.

Steve: oh!

the only acceptable image for a man to draw in his texts using colons, brackets etc. is a penis. e.g. 8---)

YAFFing by shiteater9000 April 14, 2010

Yiff in hell 

“Yiff in Hell” is a phrase used by those that oppose the furry fandom, directly aimed towards furries as a message to take the activities commonly associated with yiffing elsewhere

On 4chan, “Yiff in Hell” is typically found in Furry threads, used as a protest towards furries in an attempt to lower the amount of furry content posted on the site. While it has been seen spammed throughout threads in great numbers, certain self-identified furries have offered rebuttals stating that the argument doesn’t make sense

This is the proper meaning, rather then the "Other ones" trying to insult the Furry Fandom

Internet User: Yiff in hell furfag!
Furry: Does your swag raise money for charity?

Yiff in hell by Another Goddamn Furry June 6, 2015