Etymology: Uncertain: possibly from Cruft Hall, the name of the radar laboratory of w:Harvard, Harvard's physics department during the Second World War, which contained much old and unused technical equipment; possibly a blend of crust and fluff, both of which suggest things that are obsolete and superfluous; possibly a modified form of crust. The supposed acronym "commodity residue undergoing fanciful transit" is a backronym.
- (computing) (informal) Anything old or of inferior quality.
- (computing) (informal) In particular, redundant, old or improperly written code.
- (computing) (informal) Any kind of unpleasant code or commented out code that accumulates over time.
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