I've just learnt a new word. I see that a 'rounder' is a disreputable person or a even a criminal type'. I'd never heard this word used in this context before. (Here, a 'rounder' is what one scores when playing a UK game called Rounders, a tiny bit like baseball.)

I've now listened to all the offerings on Youtube of 'Cocaine Habit'/'Take A Whiff On Me', and I still think the Memphis Jug Band is the best.
I've played it so often now, Youtube will be asking me for a subscription.
Thank you so much all who have replied.