Top Definition
An extreme slip of the tongue resulting in a crazy new word and much hilarity.

A game can be played among friends, when a squarefagadoo occurs, the first person to shout out squarefagadoo gets a point.
squarefagadoo is in itself a squarefagadoo. Resulting from someone trying to say "Square cylinder"
by GilyGilpin October 31, 2010

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