If you think about the word Kung Fu and how it is used in casual conversation, it is often times synonymous with skill. For example, people may say, your computer kung fu is strong! Or, your home repair kung fu is very good, or your cooking-Fu is strong, or, my typing-fu is weak, etc.
Basically, any sort of skill is referred to as Kung Fu, which is technically correct, because the literal definition of Kung Fu is skill acquired through time/effort. It doesn’t necessarily refer to martial arts, although these days it has.
But most people don’t know that.
You probably don’t hear people saying, wow, your basket weaving MMA is strong! Or, your programming Taekwondo is awesome! Just doesn’t have the same zing, does it!
The only other martial art that has a metaphorical reference in everday life/conversation is Judo/Jujutsu. It’s generally in reference to a verbal encounter where one person used a passive approach against an aggressive/forceful/tense delivery to get the job done.
But even still, that is in reference to a tactic. The metaphor for Kung Fu is far more powerful in my view, because it is a connotation of expertise level.
Perhaps this evolved from the resurgence in the 90′s of Old School Kung Fu movies, where there were constant themes of developing, challenging, improving, and testing one’s Kung Fu level, where lines were very commonly spoken, such as:
Hey you, think your Kung Fu’s good? Well now, let’s see how good (pause) YOU REALLY ARE! Try my (___insert number or adjective) (___insert animal or natural element) (___insert body part)!!! (eg, 18 Fire Palms)
Perhaps it is because of not just the technical skill, but the artistry and the highly stylized aesthetics on top of it that gives the skill that sense of dramatic grandeur.
It’s not that Kung Fu (ie Chinese martial arts) is any better than other martial arts, but the way it has presented itself onscreen is so powerful that it became part of our lexicon.
I’m still developing my blog-fu. I need to train harder!