Cruft /kruhft/ [very Common; Back-formation From Crufty] 1.

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cruft /kruhft/

[very common; back-formation from crufty] 1. n. An
unpleasant substance. The dust that gathers under your bed is
cruft; the TMRC Dictionary correctly noted that attacking it with a
broom only produces more. 2. n. The results of shoddy
construction. 3. vt. [from `hand cruft', pun on `hand craft']
To write assembler code for something normally (and better) done by
a compiler (see hand-hacking). 4. n. Excess; superfluous
junk; used esp. of redundant or superseded code. 5. [University
of Wisconsin] n. Cruft is to hackers as gaggle is to geese; that
is, at UW one properly says "a cruft of hackers".