The art of using Microsoft Excel. Term commonly used to denote the users level of skill. A skilled user who has a strong level of Excel-fu usually is called upon by lower level Excel users and can enter statistical formulas from large pools of data at lighting fast speeds. Derived from the martial art Kung-fu.
Cliff: "Hey Joe, can you help me determine the mean, mode, median, upper and lower control limits from this pool of data. My Excel-fu is weak"
Joe: "Why yes young grasshopper, send me the file"