LORELAI: We have stretched ourselves as thin as humanly possible without going completely postal.
In American slang, “going postal” means to become uncontrollably angry to the point of violence, especially in a workplace situation. The expression comes from a series of incidents from the mid-1980s onward in which over-stressed United States Postal Service workers committed mass murder as a result of workplace rage. The earliest known use of the phrase is 1993.
The Annotated Gilmore Girls 