In a
government job, the day on which "the
eagle shits" is
payday. The phrase derives from the
bald eagle being a
symbol for the
United States, and hence, the
government. I personally have only had experience with the phrase in a job at the
county level, but I have talked to a few
wizened old men, and they say that they at least remember it from the time of
World War II.
Example:
"Yeah, my car just broke down, but it's okay, because
the eagle shits tomorrow."