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SPISPOPD (an abbreviation for Smashing Pumpkins Into Small Piles Of Putrid Debris) is part of a joke relating to the computer game DOOM.
Its origin can be traced back to the following Usenet post by Eli S. Bingham in early December, 1993, from the comp.sys.ibm.pc.games.action newsgroup:
This initial quip was carried on, and a parody of the DOOM FAQ was written called the SPISPOPD FAQ. The FAQ described a 3D game that ran on a computer with minimal specifications.
id Software gave a nod to the joke by planting it as a cheat code in the game. Typing "idspispopd" activates "no clipping" mode, which allows the player to walk through walls.