noun
Honorific term used to refer to someone else's son, especially a young boy from a respectable family. Often used by servants or older people addressing or referring to a boy politely.
お宅の坊っちゃんはおいくつですか。
How old is your son?
坊っちゃん、お食事の用意ができました。
Young master, dinner is ready.
noun
sheltered young man; naive rich boy
Refers to a young man who has been brought up in a well-to-do family and is inexperienced in the ways of the world; often carries a nuance of being naive or overly protected. Can be used critically or affectionately.
彼は苦労を知らない、いわゆる坊っちゃんだ。
He's what you'd call a sheltered rich boy who doesn't know hardship.
坊っちゃん育ちだから、世間の厳しさがわからない。
He was brought up as a naive rich boy, so he doesn't understand how tough the world is.