WordPress at a glance
action is not described

woocommerce_cart_emptied action-hook . WC 1.0

Usage

add_action( 'woocommerce_cart_emptied', 'action_function_name_2077' );
function action_function_name_2077( $clear_persistent_cart ){
	// action...
}
$clear_persistent_cart
-

Where the hook is called

WC_Cart::empty_cart()
woocommerce_cart_emptied
woocommerce/includes/class-wc-cart.php 649
do_action( 'woocommerce_cart_emptied', $clear_persistent_cart );

Where in WP core the hook is used WooCommerce

woocommerce/includes/class-wc-cart-session.php 49
add_action( 'woocommerce_cart_emptied', array( $this, 'destroy_cart_session' ) );