a bore hog
A meathead who takes up space but doesn't do anything useful. Like a soggy pizza crust.
My cousin is a bore hog. He talks about his cat like it's a Nobel Prize winner.
That guy at the gym is a bore hog. He flexes like he's in a Marvel movie.
My mom's boyfriend is a bore hog. He claims he's a rockstar. He's not. He's a rockstar in a bad mood.