please test this version using vars
erase the one you have

on $*:text:/^!slogan\s(.+)/iS:#:{
  if (!%floods) { 
    $iif($sock(slogan), sockclose slogan)
    sockopen slogan sloganmaker.com 80
    set -u5 %maker $replace($regml(1),$chr(32),+) 
    set -u5 %channel $chan
    inc -u3 %floods
  }
  else { .notice $nick You need to wait 3 seconds to trigger it again | return }
}

on *:sockopen:slogan:{
  if ($sockerr) { msg %channel An error happenned with the server connection: $sock(slogan).wsmsg | sockclose slogan }
  else {
    var %x = sockwrite -nt $sockname, %slogan = $+(user=,%maker,&send=Make+a+Slogan%21)
    %x POST /sloganmaker.php HTTP/1.1
    %x HOST: sloganmaker.com
    %x Connection: close
    %x Content-Type: application/x-www-form-urlencoded
    %x Content-Length: $len(%slogan)
    %x $crlf $+ %slogan
  }
}

on *:sockread:slogan:{
  if ($sockerr) { msg %channel An error happenned with the server connection: $sock(slogan).wsmsg | sockclose slogan }
  else {
    sockread %x
    if $regex(%x,/<p>(.+)<\/p><\/div>/) {
      msg %channel $regml(1)
    }
  }
}