vi. Keeping a lot of state in your head while
modifying a program. "Don't bother me now, I'm juggling eggs",
means that an interrupt is likely to result in the program's being
scrambled. In the classic first-contact SF novel 'The Mote in
God's Eye', by Larry Niven and Jerry Pournelle, an alien describes a
very difficult task by saying "We juggle priceless eggs in
variable gravity." That is a very hackish use of language.
See also hack mode.