ju-do (jdo) n. [[Jpn judo ju, soft + do, way]] a form of martial arts based jujitsu developed as a sport and as a means of self-defense without the use of weapons.

Or at least that's what the dictionary says anyway. They forgot to say that it's also a great laugh.
If you want to know a bit more about it then you could try here.

Training will resume on September 14^th 2004