machaughtiness
Machaughtiness is when you think you're the best at everything, even though you failed basic math and still don't know what a 'frigidator' is.
My aunt said she could beat anyone at chess. She lost to a kid who was playing with his fingers.
My uncle said he's a legendary chef. He burnt toast and called it 'charred artistry.'
My brother said he's a superhero. He ran out of the house when a vacuum cleaner started making noise.