Definitions by Schaap

Yamakashi 

Japanese version of freerunning/le parkour
this is where they climb/jumpoff/swing/run on/run off
buildings/cars/fences/monuments/lampposts/mailboxes

"omg, where did he come from? did he fell from the sky?"
"No, he jumped from that roof behind us, he's practising Yamakashi"

Yamakashi by Schaap August 31, 2005