Curiosity killed the cat is an idiom used to warn someone from digging to know more about unnecessary things like knowing what his friend did in his vacation in details hhhhhh.
Eye candy is an idiom, too, you can use it in two different ways. First, to express how a person is so beautiful. And in contrary, you can use it to show how a person has just good looking, but he is superficial or of empty head.
Tiger mom means to be so aggressive or nerves.