After digging around a bit I found an entry on The urban dictionary claiming it started on the TWoP Forums, adding that into the google gave me the following:
On a side note, wikipedia redirects 'pit of voles' to the fanfiction.net page, but offer no explanation of why.
-Terry
-----
"so listen up boy, or pornography starring your mother will be the second worst thing to happen to you today"
TF2: Spy
Quote:Q: What the heck is the 'Pit of Voles'?It makes sense.
A: The Pit of Voles is a nickname for fanfiction.net (another, less common one, is 'the Walls of Flesh'). I first saw it used by the ficbitches, but I am told that the very first ever appearance of it is archived here, in the ex-blog of tsukikoushi. I think the rationale behind it is something like since an infinite number of monkeys with typewriters will eventually give you Shakespeare's plays, then whatever the writers in the pit are, they aren't monkeys.
On a side note, wikipedia redirects 'pit of voles' to the fanfiction.net page, but offer no explanation of why.
-Terry
-----
"so listen up boy, or pornography starring your mother will be the second worst thing to happen to you today"
TF2: Spy