In the fantasy novels of Rick Cook, a special type of "assembly language" instruction in the WIZ-DOS magic compiler system which produced indeterminate results. The acronym means "I'll Do As I Damn Well Please," by analogy with DWIM. These instructions tended to do different things each time they were used, which made them hard to work with. It was theorized by Jerry Andrews that they represented a sort of quantum uncertainty effect on a macro level. One of these instructions made it into a beta copy of the spell compiler, because it worked reliably except for about one time in a hundred, but was left out of the production version.

E.T. Tajikawa did further research on the IDAIDWP instructions, dividing them into two categories, "regular IDAIDWP" and "FU-IDAIDWP." He described the latter category as "IDAIDWP with an attitude." (The meaning of the extra two letters in the acronym should be obvious.) He made use of the FU-IDAIDWP instructions in a magical weapon used to destroy the strange artificial life entity that menaced the Wizard's Keep and had stolen Moira's body.

Source: Rick Cook, The Wizardry Quested

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