Top definition
Nahnahnybooboo – The act of expressing opposition against another individual. To use this term to is fullest extent, one must place their thumbs in their ears with fingers spread out like moose antlers, stick their tongue out while proclaiming “Nahnahnybooboo”. Feel free to repeat as much as needed.

After Sally won the potato sack race, she turned to little Jimmy and shouted "Nahnahnybooboo, Nahnahnybooboo".
by MaltMan December 05, 2006
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