noun
dojo storming; challenging dojo members and demanding money upon winning
Refers to the practice of visiting a martial arts dojo, challenging its members to fights, and demanding payment if victorious. Often associated with unscrupulous martial artists or con artists.
道場荒らしは、昔の武道界ではよく聞かれた話だ。
Dojo storming was a story often heard in the old martial arts world.
彼
It seems he made money by storming dojos.