Meta data is save in postmeta table and to get them you can use get_post_meta($post_id,'meta_key_name',true);
so in your shortcode function globilaize $post object and get you value like that
if($something == "value") {
global $post;
$one = get_post_meta($post->ID,'value_name'true);
$two = get_post_meta($post->ID,'value2_name'true);
}