自鸣得意 self-satisfied
Explanation
形容自以为很了不起，非常得意。
describes someone who thinks they are very great and very successful.
Origin Story
话说唐朝时期，有一个秀才名叫张郎，他从小就聪明好学，饱读诗书，对自己的才华十分自信。有一年，他参加科举考试，结果名落孙山，这让他大受打击。张郎为了证明自己的实力，决定另辟蹊径，创作出一部轰动京城的巨著。他夜以继日地伏案写作，废寝忘食，终于完成了这部作品。他将作品呈送给朝廷，没想到却得到了皇帝的赏识，被封为翰林学士。张郎从此名扬天下，他时常想起自己落榜的经历，对自己的成就倍感自豪，常常自鸣得意。他常常在朋友面前夸耀自己的才华，甚至有些目中无人，让朋友们都对他敬而远之。张郎的自鸣得意，最终导致了他人际关系的恶化，也让他错失了许多宝贵的机会。
It is said that during the Tang Dynasty, there was a scholar named Zhang Lang, who was intelligent and studious from a young age, read many books, and was very confident in his talent. One year, he participated in the imperial examination, but failed, which was a great blow to him. In order to prove his ability, Zhang Lang decided to take a different path and create a masterpiece that would shock the capital. He worked day and night at his desk, forgetting to sleep and eat, and finally completed his work. He presented his work to the court, and unexpectedly received the emperor's appreciation and was appointed as a Hanlin scholar. Zhang Lang became famous from then on, he often recalled his experience of failing the examination, and was very proud of his achievements, often self-satisfied. He often boasted about his talent in front of his friends, and even became somewhat arrogant, causing his friends to shun him. Zhang Lang's self-satisfaction ultimately led to a deterioration of his interpersonal relationships and caused him to miss many valuable opportunities.
Usage
表示自以为很了不起，非常得意。常用于形容一个人对自己的成就感到非常自豪和满足，甚至有些自负。
means that one thinks they are very great and very successful. It is often used to describe how proud and satisfied someone is with their achievements, even somewhat self-satisfied.
Examples
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他考试得了满分，自鸣得意地笑了。
tā kǎoshì déle mǎnfēn, zìmíngdéyì de xiàole
He got a perfect score on the exam and smiled smugly.
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取得一点小成绩就自鸣得意，这是很不好的习惯。
qǔdé yīdiǎn xiǎo chéngjì jiù zìmíngdéyì, zhè shì hěn bù hǎo de xíguàn
It's a bad habit to be self-satisfied with a few small achievements.
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他这次演讲成功了，真是自鸣得意啊！
tā zhè cì yǎnjiǎng chénggōngle, zhēnshi zìmíngdéyì a
His speech was a success, he was quite self-satisfied!