= H =
1. [rare] The practice of translating
hot spots from an HLL into hand-tuned assembler, as
opposed to trying to coerce the compiler into generating better
code. Both the term and the practice are becoming uncommon. See
tune, bum, by hand; syn. with v. cruft.
2. [common] More generally, manual construction or patching of data
sets that would normally be generated by a translation utility and
interpreted by another program, and aren't really designed to be
read or modified by humans.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.