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<?php
/**
 * WooCommerce Extra Feature
 * --------------------------
 *
 * Display product meta field in a shortcode
 * ex: [woo_custom_field id="my-custom-field"]
 *
 */
function woo_custom_field_shortcode( $atts, $content = null ) {

  global $post;
	
	extract(shortcode_atts(array(
		"id" => ''
	), $atts));
	
	$fields = get_post_meta( $post->ID, $id);
	
	foreach( $fields as $field ) {
		return $field;
	}
}

add_shortcode("woo_custom_field", "woo_custom_field_shortcode");