Chrisago on "Exclude posts with specific slug."

Hi all,

I am trying to exclude portfolio items which have the slug name "featured".
I guess any amends needs to be done on these lines of code below.

Any help will be appreciated!

function recent_porfolios() {
    global $post;
    $exclude = $post->ID;
    rewind_posts();

    // Create a new WP_Query() object
    $wpcust = new WP_Query(
        array(
            'post_type' => array('portfolio'),
            'post__not_in' => array($exclude),
	    'orderby' => 'rand',
            'showposts' => '4' ) // or 10 items.
        );

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