夜郎自大

1.ludicrous conceit of the king of Yelang -- parochial arrogance; as cheeky as Yelang, who thinks himself the equal of the Son of Heaven; be self-assertive; be sheer parochial arrogance; Every dog's alien at home.; get too big for one's boots; get [become] too proud of onesself; ignorant presumption [boastfulness]; pass oneself off as an important person; play the great man; think no small beer of oneself; Yelang people think their country is bigger than China -- ignorant boastfulness.