Origin:
The phrase originates from the Chinese term "工合" (gōng hé) which translates to "work together". It was popularized during World War II, when American soldiers encountered it as a slogan used by Chinese laborers working on the Burma Road.
Usage:
"Gung ho" is often used in a positive way to describe someone's dedication and enthusiasm. However, it can also be used in a sarcastic way to imply that someone is overly enthusiastic or even blindly devoted to a cause.
Examples:
* "The team was gung ho about winning the championship."
* "She's gung ho about her new job."
* "He's so gung ho about his diet, he won't even eat a single potato chip."