juggling eggs: 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 1975 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." See also hack mode and on the gripping hand.