蛋疼少年！
教练我想打篮球 originates from a popular Chinese reality TV show called "Dunk of China" (燃烧吧！蛋疼少年！) which aired in 2018. In this show, contestants showcase their basketball skills and compete against each other for a chance to win a professional contract with the Chinese Basketball Association (CBA). The phrase "教练我想打篮球" (Coach, I want to play basketball) became a catchphrase often used by contestants to express their passion and desire to participate in the competition.