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?