obversal
Making up a fancy word just to sound like a genius, even though no one knows what you're talking about.
He said 'floobatious' and called it a new language. No one asked what it meant.
She used 'zombatize' in her presentation. The teacher gave her an A, but no one else knew what it meant.
He used 'flibbertigibbet' and called it a genius move. Everyone just stared.