Noun. A disease characterized by excessive foaming at the mouth induced by fun dip, a tang 'stache, and extreme frostbite from fort-building in the snow. Origin relates back to a young girl from Wisconsin's best weapon in her quest to make her BFF King of Television.
"That pink foam is a clear sign of Rybies."

"SICK! That guy just wiped his Rybies all over the door handle at McDonalds."

"Nate just bit Pete and passed on his Rybies."
by NicRybies January 04, 2006

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