KUNG

Set to 2 different clues across 3 published puzzles, most often “___ fu” — The New York Times, Friday, 14 January 2011.

4 letters

Every clue on record, most used first

___ fu2 times
The New York Times — Friday, 14 January 2011
"___ Pow! Enter the Fist" (2002 spoof film)once
The New York Times — Saturday, 11 October 2008