question on a query on index.php

[houseofpolitics]

$forumusers = $db->query_read_slave("
SELECT
user.username, (user.options & " . $vbulletin->bf_misc_useroptions['invisible'] . ") AS invisible, user.usergroupid,
session.userid, session.inforum, session.lastactivity, session.badlocation,
IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid, infractiongroupid
$hook_query_fields
FROM " . TABLE_PREFIX . "session AS session
LEFT JOIN " . TABLE_PREFIX . "user AS user ON(user.userid = session.userid)
$hook_query_joins
WHERE session.lastactivity > $datecut
OR user.username='BLAHBLAH'
$hook_query_where
" . iif($vbulletin->options['displayloggedin'] == 1 OR $vbulletin->options['displayloggedin'] == 3, "ORDER BY username ASC") . "
");


On the code above, I want to include the person who has a username of BLAHBLAH.

How do I do this? The code that I tried to add,
OR user.username='BLAHBLAH'
doesn't work. Can anyone help me?