a grown ass man
A grown ass man is a man who's supposed to be an adult, but he's still doing stupid stuff like not paying the bills or wearing a shirt that says 'I ❤️ my mom'.
He's a grown ass man, but he still wears socks with sandals.
He's a grown ass man, but he still argues with his kid about the TV volume.
He's a grown ass man, but he still has a big butt.