Top Definition
An anonymous person who gives you frozen yogurt (fro-yo)
*opens the door and finds frozen yogurt at doorstep*

John: What?! Someone left frozen yogurt on my doorstep and ran away!

Eric: Did they leave a name?

John: No.

Eric: They're such a fro-yo-nonymous.
by pseudosynthesizer September 29, 2011
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