A blanket term for 95% of the martial arts offered in the United States. Homogenous white-bread crap. Choice of school little matters when one is choosing between different brands of Karafudo. It's slightly less important than which packet of ramen you finally decide to cook.
Includes most karate and tae-kwon-do schools in the United States, along with kickboxing and various malformed strains of "combat Tae-bo." Kung fu schools that claim to teach simply "kung fu" are also part of the revolting institution that is Karafudo.