A word used inside of furry fandom based on the word yiff.
The word's primary uses are to declare somefur or something as either sexy or horny, although it can also mean less sexual things such as interesting, or exciting.

Examples:
"Check out that black fox-morph! Murrr... He's one yiffy hunk of meat."
"Did you see that new pic on the VCL? Man, did that ever make me yiffy."

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