Noun
slag heap (plural slag heaps)
A man-made mound or heap formed with the waste material (slag) as a by-product of coal mining. Can also refer to the waste by-product from a foundry or furnace, formed into such a mound.
I do not believe that anything really worthwhile will come out of the exploration of the slag heap that constitutes the surface of the moon...Nobody should imagine that the enormous financial budget of NASA implies that astronomy is now well supported. Fred Hoyle
I don't buy into you're on the slag heap when you're 40 or 50 or 60 or 70 or whatever. Joan Collins