嘿沙雕是一个俚语，用来形容一个人自以为很有才华，实际上并不那么优秀的人。它的来源可能源于清朝时期，当时有一种叫沙雕的鸟，它看上去很高贵，实际上并不那么优秀。
下面是一些例句：
"你这个嘿沙雕，以为你很厉害，其实你什么都不会。" (You think you're so great, but you're actually a total hack.)
"别看他那副大牛样，其实他就是个嘿沙雕。" (Don't be fooled by his tough guy act, he's just a poser.)
"这个计划真是个嘿沙雕，根本行不通。" (This plan is just a piece of crap, it'll never work.)