自以为得意zì yǐ wéi dé yì

feel very pleased with oneself; preen oneself on sth; show self-satisfaction
❍ 如果有其志而无其才，乱点古书，重抄笑话，吹拍名士，拉扯趣闻，而居然不顾脸皮，大摆架子，反～，——自然也还有人以为有趣，——但按其实，却不过“扯淡”而已。(《鲁迅选集》Ⅳ—156) If you have just the will without ability,bungling the punctuation of ancient books,simply copying old jokes,fawning on famous scholars and telling funny stories,yet preening yourself on being a splendid fellow and losing all sense of shame,of course some may find it aiilusirig,but the fact is this is simoly twaddIe.