Etymology of 「ボンボン」 meaning "green young man from a well-to-do family" in Kansai dialect
I came across this word and the most fitting definition in JMdict was the fifth one here.
What does it come from? None of the defined in JMdict describe a "green young man from a well-to-do family" in my opinion. There's also the French loanword meaning sweets, so maybe that's related somehow.