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Exceptionally enthusiastic, eager, or zealous, sometimes overly so. There are plenty of pitfalls that gung-ho entrepreneurs don't stop to consider. I was all gung-ho about this graduate program when I first began, but I must admit that I've grown sick and tired of these boring lectures.
Inf. enthusiastically in favor of something. Bobby is really gung ho on his plan to start his own company.
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.