Yiffed 

Connected with Anthropomorphology, yiffed is the past participle of yiff. (That means that it is the past tense of yiff) When two or more anthros have mated, you say, they have yiffed

Yiff, Yiffing, Yiffed. In that order

When we finally got home we yiffed all night.

Yiffed by Player May 6, 2005

Yiffed out 

Used to express when one has had enough "Yiffing"

"I'm not performing like I normally do, I'm really yiffed out"

"She said something about being yiffed out, I guess she was up all night on the computer"

Yiffed out by Diamondback25x November 20, 2009

Yifferendum 

A detailed book with a list of all known people who identify as a furry

Man 1: Hey man! Do you know if Kyle is a furry?
Man 2: No clue, lemme go check the yifferendum

Yifferendum by ZeroHero75 March 27, 2021

Yuffed 

When you give up on Final Fantasy 7 because you couldn't find Yuffie after she stole your materia

Person 1: "Hey, did you make it past Wutai?"
Person 2: "No, I got Yuffed"

Yuffed by Definitely not Tifa March 22, 2021

Yaffed it up 

v. Yaffed (rhymes with laughed) use in place of fucked. Describes the general screwing up of something.
The word originates from the last name of an MIT professor who continually yaffes things up

n. yaffer: like a jack in the box, but is hideous and has two different ears. also can mean asshole

You are such a yaffer!

I yaffed it up

"Whoa, whoa, whoa, what am I looking at?"
"A yaffer"

go yaffe yourself

Yaffed it up by yaffe lab July 6, 2006

Yiffer 

Noun: Someone who likes to yiff; to yiff frequently

Matt is such a yiffer.

Yiffer by Lupis Lupine July 25, 2003

yiffeh 

Geeky spelling of the furry fandom word(s) for various things.
Please see yiffy and/or yiff.

1) Damn. That raccoon is yiffeh!
2) BBL, going to look at some yiffeh. =O

yiffeh by Neon Wolf July 16, 2008