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Toy for lonely furfags such as Crapoartworks to yiff Scary isn it? Defies description. Edit Euphemisms Yiffing comes with its own set of sexual euphemisms, in addition to many of the same slang terms used in human sex. The first reply chose was from guy calling himself Wolfegang, as you can guess this guy fancied himself to be wolf. When you put enough foxes on same square, all yiffer games of those foxes turn to your color and spread to the adjacent squares.