[a play on "read-only memory"] Code so arcane, complex, or ill-structured that it cannot be modified or even comprehended by anyone but its author, and possibly not even by him/her. A Bad Thing. [Jargon File]

In addition suitable contents:
[ = ] [ ad ] [ am ] [ an ] [ ar ] [ arc ] [ arg ] [ at ] [ au ] [ B ] [ b ] [ Bad Thing ] [ be ] [ by ] [ C ] [ ca ] [ ch ] [ co ] [ com ] [ de ] [ du ] [ ed ] [ eh ] [ er ] [ fi ] [ file ] [ h ] [ hat ] [ hing ] [ hr ] [ id ] [ ie ] [ il ] [ in ] [ it ] [ J ] [ Jargon File ] [ la ] [ Lex ] [ ly ] [ memory ] [ mo ] [ mod ] [ module ] [ mp ] [ na ] [ ne ] [ ng ] [ nl ] [ nn ] [ no ] [ om ] [ ph ] [ pl ] [ pr ] [ query ] [ rc ] [ re ] [ ru ] [ se ] [ si ] [ so ] [ st ] [ struct ] [ T ] [ th ] [ tr ] [ ve ]