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Na Na Na Boo Boo is like the preschool version of a middle finger. It’s the sound of a kid who just got squished by a giant cookie and wants you to know it. It’s usually said in a high-pitched, annoying singsong way.
My cousin said 'Na Na Na Boo Boo' right in my face when I ate the last of her ice cream.
During recess, my friend yelled 'Na Na Na Boo Boo' because I took his snack.
My little brother said 'Na Na Na Boo Boo' after I kicked him.