SPISPOPD

SPISPOPD, part of the cheat code "idspispopd", is an abbreviation for Smashing Pumpkins Into Small Piles Of Putrid Debris. Its origin can be traced back to the following Usenet post by Eli S. Bingham in early, from the newsgroup:

Listen up, ID Software!

Next time you have an impending release of a much anticipated game, make sure its name is not so cool-sounding as DOOM and much longer to eliminate all of the casual "Where can I get xxx" posts. How about "Smashing Pumpkins Into Small Piles Of Putrid Debris" for the next game?

This initial quip was carried on, and a parody of the Official 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. Dave Taylor was most likely the programmer who did this. 

A reference also appeared in the first Doom novel, wherein one of the two major characters says, "Smashing pumpkins into small pieces of putrid debris," after killing a cacodemon (which they dubbed a "pumpkin").

The song "Where Boys Fear to Tread" by included Doom samples and specifically credited id Software in the liner notes to their album, "Mellon Collie and the Infinite Sadness." It's likely the original USENET post was referencing the band.

Two computer games were created based on the joke. Smashing Pumpkins into Small Piles of Putrid Debris is a 2D action game from Jamul Software (later Hamumu Software) in which the player collects candles and smashes pumpkins with a red hammer. It was reportedly developed in 48 hours to capitalize on the joke. Hamumu Software later created a similar game called Amazin' SPISPOPD.

Simtex's 1994 game Master of Magic included a magical item called Idspispopd.