Macrocious
A person or thing that is so full of hot air they think they're the best at everything and everyone else is just a waste of time.
My cousin is macrocious. He thinks he's the best at everything and everyone else is just a joke.
This YouTube channel is macrocious. It's just one guy talking about his day for 10 hours straight.
My dad is macrocious. He won't stop talking about his job like it's the most interesting thing ever.