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A loud, stupid noise you make when you're trying to be funny but you're just being an idiot. It makes people want to cry, laugh, or just throw things at you.
My brother said 'hobbledabble' during a serious meeting. The boss threw a stapler at him.
I yelled 'hobbledabble' at my dog. He ran away and pooped on my shoes.
My friend used 'hobbledabble' in a math test. The teacher gave him a zero.