公子哥儿 Young Master
Explanation
指那些出身富贵家庭，只知道吃喝玩乐，不务正业的子弟。
Refers to the offspring of wealthy families who only know how to eat, drink, and have fun, and who do not engage in any useful work.
Origin Story
话说江南水乡有一户富甲一方的沈家，沈家公子沈玉，生得风流倜傥，却是个不学无术的公子哥儿。每日里游山玩水，斗鸡走狗，挥金如土，家中产业被他败坏殆尽。他父亲沈老爷气得七窍生烟，无奈之下，只得将家业变卖，送他去书院读书，希望能改变他的习性。然而沈玉依然故我，整日里与狐朋狗友厮混，沉迷于声色犬马之中，最终落得个家破人亡的下场。这便是典型的公子哥儿，不思进取，最终自食其果的悲惨结局。
It is said that in the water town of Jiangnan, there was a wealthy family named Shen. The young master Shen Yu was handsome and charming, but a useless and indolent young man. Every day he spent his time wandering in mountains and rivers, cockfighting and dog running, squandering his wealth, until the family’s wealth was almost ruined. His father, Mr. Shen, was furious and finally sold the family's property to send his son to an academy, hoping to change his habits. However, Shen Yu remained unchanged, associating with bad friends every day and indulging in sensual pleasures. Eventually, he ended up with a ruined family. This is a typical case of a useless young man who did not make progress, and finally reaped the bitter fruits of his own deeds.
Usage
通常用于形容那些不务正业，只知道吃喝玩乐的富家子弟。
It is usually used to describe those wealthy young men who do not engage in any useful work and only know how to eat, drink, and have fun.
Examples
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他就是个不学无术的公子哥儿，成天只知道吃喝玩乐。
tā jiùshì ge bùxué wúshù de gōngzǐ gē ér, chéngtiān zhīdào chīhē wánlè.
He is a useless young man who only knows how to eat, drink, and have fun.
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那个公子哥儿挥金如土，一点也不懂得节俭。
nàge gōngzǐ gē ér huījīn rú tǔ, yīdiǎn yě bùdōngde jiéjiǎn
That young man squanders his money and doesn't understand thrift at all.