Yo-Yo Daniel Guidotti 14 years ago Yo-YoA colloquial term for a stock market that is very volatile.Random Finance Terms for the Letter YY-ShareYellow KnightYellow SheetsYield BasisYield ElbowYield Spread PremiumYield to CallYield to MaturityYield to WorstYo-YoRecommended for you:Y-Share Yield Basis Yellow Sheets Yield Elbow