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?
Young master, dinner is ready.
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.
He's what you'd call a sheltered rich boy who doesn't know hardship.
He was brought up as a naive rich boy, so he doesn't understand how tough the world is.
He was raised as a sheltered rich boy and doesn't know the harshness of the real world.