jeffp and Snuffy, thanks for that explanation of the word "rizla".

Admittedly, none of this is of earthshaking importance, but these examples point out how words & phrases in popular songs and children's playground rhymes can be misunderstood because of insufficient knowledge of the culture/s from which the songs and/or rhymes come.

The use of the word "rizla" also might denote another cultural difference-in much of the USA (except for rolling marijuana "cigarettes") most Americans buy ready made cigarettes already packaged while in some other parts of the world, people buy pouches of tobacco and make individual cigarettes when they want to smoke them.

Given that explanation for the word "rizla" instead of the familiar USA version:
"the monkey chewed tobacco on the street car line", in that UB40 "Red Red Wine" verse do we have "the monkey rolled his tobacco" or "the monkey carried his tobacco" on the sweet dep line?

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So now that the word "rizla" is explained, what about the word sweet and the word "dep" and the phrase "sweet dep line"? Could "dep" just be a shortened form of the word "department" (perhaps meaning a transportation department which could be another name for a street car or trolley line or railroad line? And does a "sweet dep line" mean a department "line" (transportation grid) that is "sweet" because it is important, or "cool" or good because it leads to certain cool or good or important places like a big city with all sorts of urban places of amusements?