a Joe safe is a shot in Pool or Billiards where the shooter tries to make his ball and misses, but he luckily safes the other player. For example, I am trying to make a ball and I miss but I snooker the next guy. This is called the Joe-safe. This is the Jo-safe because a gentleman in Phuket Thailand routinely did this either by skill or luck.
Man, this guy Joe-safed me again. I can never catch a break.