pachyderm
A giant elephant who doesn't give a rat's ass what people say about him. He's got a face like a brick and a heart like a meatball.
I'm a pachyderm. I don't care if you call me a meatball or a brick.
She's a pachyderm. She eats my lunch and laughs in my face.
He walked into the room like a pachyderm. No one even blinked.