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A'nnesia is a fancy word for someone who acts like they're smarter than everyone else and thinks they know everything. They're usually full of themselves and love to show off.
"You think you're fancy? I've been to Paris and back, and I still don't need your stupid advice."
"I don't need to text you back. My life is way more interesting than yours."
"You think you're cool? I've been to more parties than you've had hot dinners."