To throw up or expel something from within.
I feel like i'm gonna yiff. Did you see that guy yiffing all over the place.
by Ty C May 21, 2006
Term used by furfaggots to denote any form of sex, sexuality or anything of that sort. It usually involves an animal and is about the most fucked up thing on the planet.
Yiff in Hell furfags!
by CheeseAnonymous February 29, 2008
To throw up. To feel queasy or sick.
"God, that is making me yiffy."

"I think I'm going to yiff."

"I just yiffed in the sink."
by P. Katto June 03, 2003
v. To make love to a plush animal.

adj. "Yiffy" A plush animal that has been spooged on.
I think KickFag gets yiffy with that plush tiger in his room.
by Mario Rogic January 17, 2003

1.) Furry code word for "violently rape." Usually used in reference to the anal ("tailhole") orifice of a male animal they intend to penetrate with their sad excuse for a penis.
2.) To dress up in a fursuit, find another furry dressed likewise, and hump them while in the fursuit. Sole form of furry sexual gratification not involving the need to "paw off".
1.) "Hey, let's go yiff that sheep!" said GoldenMan323 to his furry friends. Unfortunately, Farmer Bob disagreed with the idea.

2.) Watching furries yiff is like watching a Cheney vs. Rove boxing match. Nobody wins, and everybody who watches it is gonna lose.
by Lenin's Bastard Son September 11, 2004
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