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Nahnahnybooboo is when you hate someone so much you stick your tongue out and scream it like a f***ing banshee. It’s the ultimate middle finger in human form.
My cousin did a full Nahnahnybooboo during my birthday speech. I still can’t hear.
She did a Nahnahnybooboo in the school hallway. The principal had to come out.
He did a Nahnahnybooboo during the championship game. We lost because of it.