Top Definition
Someone who is a mixture of Irish and Italian. He/She will be able to tan even though they have a freckly Irish complexion. They will know how to cook Chicken Parm as well as Shepherd's Pie. They will often get drunk on red wine and/or annisette and Guinness and/or Jamison's Whiskey. Guidochaun's are often CrAzY drunks that will get into lots of trouble while intoxicated.
You know that guy Giovanni O'Neal that got arrested for riding a tiger from the zoo down the center of Market St the last time we all got drunk? He's a real Guidochaun.
by November 16, 2011

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