Always shouts out something obscene / Such a dirty old man

You're nothing but a dirty, dirty old man / You do your thinking with a one-track mind

Moving her arm up and down between them, she said in a still louder voice, "Admiral indeed! Dirty old man, if you ask me! He drove his wife to an early grave with his woman chasing. Now he's spending Nancy's money on the likes of her, that slut—that—that naked hooker.

If you didn't go for Lila you're some kind of prissy old prude. If you did go for her you were some kind of dirty old man.

Dirty old man

Meaning

Noun