Snowball in Hell is not only a very fine song by They Might be Giants, it is also a phrase, although a very seldomly used one, that basically means no chance. Since the TMBG song was released, it's become more commonly used in work situations. (See example 2)
Damn. I've got as much chance to pass this test as a snowball in hell.
I know this new "Consultant" asshole is gonna get me laid off.... I feel like a snowball in hell.