An acronym that is used for repairing/completing a co-worker's work on the weekend as they either don't work on the weekend or are too slack to finish their work before the new week. This term originated from a hard working computer technician who had to put up with Maria's inept work ethic and had to complete his own work as well as hers.
I dread FAMFUS. Yes, Saturday was a FAMFUS. Did you notice that bad work, I feel a FAMFUS coming!