idiom~~有冇人知out of the world解咩呀～中英ｍｅａｎｉｎｇ都要呀

out of this or the world means :
exceptional; fine:
e.g.The chef prepared a roast duck that was out of this world.

out of this or the world means :
不平凡的；極好的：
例子：他所烹調的烤鴨是極好的.

希望可以幫到你=）...........................................