WordPress at a glance
action is not described

wp_delete_nav_menu action-hook . WP 3.0.0

Fires after a navigation menu has been successfully deleted.

Usage

add_action( 'wp_delete_nav_menu', 'action_function_name_8589' );
function action_function_name_8589( $term_id ){
	// action...
}
$term_id(int)
ID of the deleted menu.

Where the hook is called

wp_delete_nav_menu()
wp-includes/nav-menu.php 285
do_action( 'wp_delete_nav_menu', $menu->term_id );

Where the hook is used (in WP core)

Does not used.