hack
= H =
hack mode
hack attack n.
[poss. by analogy with `Big Mac Attack'
from ads for the McDonald's fast-food chain; the variant `big
hack attack' is reported] Nearly synonymous with hacking run,
though the latter more strongly implies an all-nighter.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.