Show Product Description on Cart & Checkout

Source:

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// add this filter in functions.php file
add_filter( 'woocommerce_get_item_data', 'wc_checkout_description_so_15127954', 10, 2 );
function wc_checkout_description_so_15127954( $other_data, $cart_item )
{
    $post_data = get_post( $cart_item['product_id'] );
    $other_data[] = array( 'name' =>  $post_data->post_excerpt );
    return $other_data;
}