Dorky kid who does karate. Is also applied sometimes to anyone who does karate since the martial art became uncool in the 1990s, and the status it once held in the 1970s and 1980s has been taken by jiu-jitsu and muai-thai. This is why doing karate is something you don't brag about unless you are a dork or old.
Lenny: I take karate courses. I'm a red belt.
Alexa: Karate dork, karate dork, karate dork! You're a karate dork!