To be smugly complacent; to gloat over one's success; to blow one's own horn.
他一取得小成就就得意自鸣，让人觉得有些不谦虚
He becomes smug and self-satisfied at every small achievement, which makes people feel he is a bit immodest.
Next Idiom
To be smugly complacent; to gloat over one's success; to blow one's own horn.