Someone

on *:text:!afk on*:#:{ 
  if ($nick == JeNnA) {
    set %away on
    set %awaymsg $3- $+
    notice $nick You have set your away message as: $3- $+
  }
}
on *:text:*jen*:#:{ 
  if (%away == off) { halt }
  if (%away == on) {
    notice $nick JeNnA is afk: %awaymsg
  }
}
on *:text:!afk off*:#:{ 
 if ($nick == JeNnA) {
   set %away off
   unset %awaymsg
   notice $nick You have unset your away message.
 }
}