Code:
aliias slapall {
  var %u  = 1, %chan = $active, %nicks
  while ($nick(%chan, %u) != %null) {
    var %nick = $ifmatch
    if (%nick != $me) %nicks = %nicks $+(%nick,$chr(44))
    /inc %u
  }
  if (%nicks) /describe %chan slaps $left(%nicks, -1) around a bit with a large trout
}


Goes in remotes, then use /slapall in the channel you wish to slap everyone in.

-KingTomato