Informal.| 1. | wholeheartedly enthusiastic and loyal; eager; zealous: a gung-ho military outfit. |
| 2. | in a successful manner: The business is going gung-ho. |

Extremely enthusiastic or zealous: “He was gung-ho about going on a vacation to the beach.”
gung-ho
[ˈgəŋˈho]
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"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]
gung ho
Also, gung-ho. Extremely enthusiastic or dedicated, as in She was gung ho about her new job. This expression was introduced in 1942 as a training slogan for a U.S. Marine battalion, derived from what an American officer thought were Mandarin Chinese words for "work together." It was actually an abbreviation for the name of Chinese industrial cooperatives.