Eat their hearts
You brag like a madman about being better than someone else, usually a famous person or someone you think is cool. You sound like a kid who just won the lottery.
I said I'm better than LeBron. My friends laughed, but I still said it.
My brother told me he was better than Einstein. I didn't believe him.
I posted on Twitter I'm better than Taylor Swift. She replied with a middle finger.