Fyifv: A Microsoft Urban Legend (2001)
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However, it was possible to be "fully vested" in a practical sense. If you didn't review well, your initial option grants would dwarf your continuing grants. Even more so if you were an acqui-hire.
A more common expression, in my circle at least, was "I would shovel shit for what they're paying me now," in reference to the fact that the closer you get to your next six-month option vesting date, the more you're getting "paid" for each day of work. A reminder to balance your frustrations against the fact that you'll be collecting $50K, $100K, $200K a day to just shut up and keep your head down for a few more days.