function my_add_forum_topic_to_page_title( $title ) {
	global $bp;

	if ( $bp->current_action == 'forum' && $bp->action_variables[0] == 'topic' ) {
		if ( bp_has_forum_topic_posts() ) {
			$topic_title = bp_get_the_topic_title();
			$title = $topic_title . ' | '. $bp->bp_options_title . ' | ' . get_bloginfo( $name );
		}
	}
	return $title;
}
add_filter( 'bp_page_title', 'my_add_forum_topic_to_page_title' );