Oh my bad. I thought you were laughing when you said that...I should have read your whole sentence closely. :p

This should do it:

on @*:text:*:#:{
  var %e = lol|lm(ao|fao)|haha
  if (!$nick(#,$nick,oh)) && (!$regex($1-,/( $+ %e $+ )/iS)) {
    if ($readini(logs.ini,$nick,last) == $strip($1-)) {
      if ($readini(logs.ini,$nick,warns) == $null) {
        writeini -n logs.ini $nick warns 0
      }
      writeini -n logs.ini $nick warns $calc($readini(logs.ini,$nick,warns) + 1)
      if ($readini(logs.ini,$nick,warns) == 4) {
        .kick $chan $nick Repetitive messages
      }
    }
    if ($readini(logs.ini,$nick,last) != $strip($1-)) {
      writeini -n logs.ini $nick warns 0
    }
    writeini -n logs.ini $nick last $strip($1-)
  }
}