i'm a swell guy - A guy who thinks he's cool but only knows how to talk about

A guy who thinks he's cool but only knows how to talk about himself.

I'm a swell guy. I got a promotion, and I didn't even do anything to deserve it.

I'm a swell guy. I posted a selfie in the middle of the night and expected 100 likes.

I'm a swell guy. I told my friends I was going to be rich someday. They didn't believe me.