Your current code will kick yourself out. You want to make sure the message doesn't get sent every time when they are voiced. You can just use the r instead of a,ovh, and last but not least, you can use the local variable instead of the global:

menu * { 
  Masskick -v {
    $iif($nick(#,0,r),msg # Mass Kicking Normal User...)
    mode # +i
    var %k = $nick(#,0,r)
    while ($me isop #) && (%k) && ($v1 != $me) {
      var %k.number = $calc(%k.number + 1)
      kick # $nick(#,%k,r) Masskick!!1 ┌∩â”(â—£_â—¢)┌∩â”
      dec %k
    }
    .timer 1 15 mode # -i
  }
}