What is the X in X-mas?
also gung-ho, gungho, 1942, slang motto of Carlson's Raiders (2nd Marine Raider Battalion, under Lt. Col. Evans Carlson, 1896-1947), U.S. guerrilla unit operating in the Pacific in World War II, from Chinese kung ho "work together, cooperate." Widely adopted in American English c.1959.
Borrowing an idea from China, Carlson frequently has what he calls 'kung-hou' meetings .... Problems are threshed out and orders explained. ["New York Times Magazine," Nov. 8, 1942]
Extremely enthusiastic or zealous: “He was gung-ho about going on a vacation to the beach.”
Very zealous; totally committed; enthusiastic: They were gung ho about the opportunity, their talk charged with an eagerness/ reminiscent of the gung-ho shot making that brought him so many grass-stained knees at Wimbledon
[WWII Marine Corps; fr the name of a Chinese industrial cooperative organization, kung ho, ''work together,'' adopted as Gung ho! to be the battle cry of a Marine Corps raiders group in World War II]