Display custom fields on post excerpt or teaser

The way to retreive some meta data is knowing the name of the custom field, for my example I will use: listing, property and address; normally this can be done after while (have_posts()) : the_post();

$listing = get_post_meta($post->ID, 'listing', true);
$property = get_post_meta($post->ID, 'property', true);
$address = get_post_meta($post->ID, 'address', true);

then you can print the output like echo $listing; according your needs.