Well just for fun
I made it in like 5 minutes so excuse for not being any advanced script

what to do :
msg the bot .s.def [a nickname] [and what the nickname is]
egsample :
/msg slchatbot .s.def sl is a kewl dewd

then type in the room sl

enjoy :)

on 1:text:.s.def*:?: {
  if ($2 != $null) {
    writeini -n def.ini def $2 $3-
    msg $nick 7,0 $+ $2 is now set as10 $3-
  }
  if ($2 == $null) { u have to say a nick and then his/her description }
}
on 1:text:*:#: {
  set %sl.d $readini(def.ini, def, $$1)
  if (%sl.d != $null) { msg $chan 7,0 $+ $1 6:10 $+ %sl.d | unset %sl.d }
  id (%sl.d == $null) { halt }
}