rich kid; person who grew up wealthy
Often used with a slightly critical or envious tone to describe someone from a privileged background who may be naive or sheltered.
He's a rich kid who doesn't know hardship.
Because he grew up as a rich kid, he can be a bit naive about the world.
Standard kanji-kana mixed spelling.
Kanji spelling for 所; less common but still used.
From いい (good) + とこ (contraction of ところ, place/family) + の (possessive particle) + お坊ちゃん (young master from a good family). The phrase literally means 'young master of a good family'.