Where all the googlewhacks of the world are stored, at the googlewhack homepage.
"Once you find a googlewhack, you can store it in our whack stack."
A person's collection of pornography. Stack refers to a time when all porn was in print and thus stacked in a cubbyhole in the porn dungeon, equipped with infrared motion sensors, high resolution cameras, lava pits, and crocodile infested waters.
My roommate found my whack stack while I was out Saturday. Talk about awkward.