From the album Foreign Tongues
This is a song about watching from a safe distance while pretending it's your mother's fault. The narrator catalogs every move Delilah makes like he's been following her for months, then hides behind mama's rules when it's time to actually approach her. He's just another guy giving her a second look, except he's convinced himself he's different because he has an excuse.
Always gets a second look from fellas passing by / Every time you see her, she's with a different guy
He positions himself as an observer of other guys' behavior, but he's clearly one of them. The detail work here is obsessive. He knows her routine well enough to say 'every time' and 'always.'
My mama don't allow me / Fool around all night
This arrives as an explanation for why he can't pursue her, but nothing in the verses suggested he was trying to. Mama's prohibition solves a problem he invented to avoid the actual risk of being another guy she cycles through.
Maybe she will settle down, marry after 'while
The word 'maybe' does a lot of work here. He's speculating about her future like he has insight into what she wants, but the song has given zero evidence she's said anything to him directly. This is a guy imagining a version of her that fits his story.
Local Casanova, who wouldn't be outdone / Let her steal his heart away and break it just for fun
He describes this like a cautionary tale he's watching from outside, but the entire song proves he's just as fixated. The difference is the Casanova took the risk and the narrator is still cataloging her movements from across the street.
Well, you are so tantalising, you just can't be true
This line keeps insisting she's unreal, too good to exist. That's the move. If she's not real, he doesn't have to deal with the fact that she's a person making choices he's not part of.
This song thinks it's about a woman who's too beautiful and too free to be trusted. What it actually reveals is a guy who has studied her from every angle and constructed an entire romantic narrative without ever talking to her. Mama's rules are just the most respectable way to stay exactly where he is.