Code:
on @*:KICK:#: /inc -u10 %kick. [ $+ [ $nick ] ]
on @*:JOIN:#: {
  if (%kick. [ $+ [ $nick ] ]) {
    /ban -u10 $nick 2
    /kick $chan $nick Autorejoin on kick is not nice
  }
}

I guess?

-KingTomato