To yiff or go through a sexual act with a penis of a furry
Dong Yiffer: Hey I Yiffed My Fifth Dong!
Friend: You need to cut down on the yiffing
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One who yiffs Yoshis.
John: Notices Yoshi bulge. OwO, what's this?
Max: *noticed* Unnoticed. YOU ARE A YOSHI YIFFER.
Yiff / yip - the noise a (fox) makes when mating
Yiffer - a Furry* (below) who enjoys engaging in sexual activity while in their fursona/suit. They may or may not use the noise, and may or may not use their full fur suit or a partial, such as just the head or just the tail etc.
*an enthusiast for animal characters with human characteristics, in particular a person who dresses up in costume as such a character or uses one as an avatar online.
"People tend to look down on yiffers, comparing them to bestiality"
"My friend Tanner was a yiffer but he kept it mostly to himself"