I was chatting with a Chinese penpal recently and when I asked "what are you doing?", I received the following answer:
Now, "东西" means "east and west" and so "吃东西" literally means "eat/eating east and west".
After I asked for explanations, I got this reply "I am eating something". The explanation included the fact that this depends on context.
So, how did 东西 come to mean "something"? And in what contexts can it be found with what meanings?
If the list is long, include only the most famous cases (5, 10 cases).