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Not actually but I used to advocate sustainable mobility in my town a couple of years back . I really dunno what a bike messenger is!

Great! Bike messenger or bike courrier, you bring things to people by bike (like express delivery services as Fedex or similar)

Thanks @airmatti! I was actually misinterpreting the word. Grateful to you for your enlightenment on it. Re-read your comment and it makes more sense to me now 😊

My brother did that as a job for a few years in Toronto.