It's a place where socks get tangled and lost in an infinite loop of disappointment.
Here's the story of one particularly egregious example:
3: The Sock of Socks
The Sock of Socks was the most egregious of all. It was a sock of socks, but not just any sock of socks. It was a sock of socks with no matching pair.
Read more about the Sock of Socks