Learn English – What’s the deep meaning in the lyrics of “Heavy Traffic” by Elton John?

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In the lyrics, some pieces I couldn't understand very well:

Shakey wake up thirsty from a night in the bar
And snake hips Joe is Mr. Cool

What's snake hips? And, does the name Joe have a special meaning?

Out on the boulevard
The pimp from the Jack of Diamonds

I guess Jack of Diamonds is somewhere similar to Casino, yes?

Just got another Jane Doe
She just got off the last bus from Montecedo

Why Jane Doe? Is the guy very special?
And where is Montecedo?

Sailor boys find trouble in the alien state
It's one on one from Las Palmas to the Golden Gate
Fly boys on the corner waiting for a ride
For twenty bucks he'll pull the cork on the man inside

Why on the corner, but not in the corner? And what means waiting for a ride?

I'm also confused with the phrase pull the cork on the man inside.

`Cause we're rolling in heavy traffic
Judy's in the jump seat and Jody's in the bucket
Billy likes to drive and Jackie's just high
And Cindy thinks we're all gonna commit suicide

How to understand the word rolling?

`Cause we're rolling in heavy traffic
Yeah we're rolling in heavy traffic

Mack he's got his Marlboros tucked up in his sleeve

FWIK, Marlboro is a brand of cigarette, yet? But how do Mack hidden Marlboro in his sleeve?

He's shacked up in his basement making P.C.P.
He used to shake the french fries

What P.C.P was Mack making?

Down on 12th and Maine
And now he stays up nights on apple juice and cocaine

How to understand Down on 12th?

I know I have got too many questions, but any help pointing out answers is appreciated.

Best Answer

Jack of diamonds is also a playing card. There are four suits: hearts, diamonds, clubs and spades. Jack is the card between a 10 and a queen.

Jane Doe means unknown female person; John Doe is the male equivalent. It means she is a small town girl from some backwater village.

Tough guys used to roll their sleeves and put a cigarette box into the wrap, so that the box is next to biceps muscles. Google "cigarette rolled in sleeve" for pictures.

PCP, aka Angel Dust is hallucinogenic drug. Shaking french fries means that Mack used to work in a fast-food restaurant, which usually is poorly paid.

Down on 12th means 12th street. In the United States, streets often are numbered instead of having "real" names.