jimlongo on "[Plugin: WooCommerce - excelling eCommerce] order_item_meta"

I guess you just query the database

$var = $wpdb->get_var( "
		SELECT wm.meta_value
		FROM wp_woocommerce_order_itemmeta wm JOIN
		wp_woocommerce_order_items wo
		ON wm.order_item_id = wo.order_item_id
		WHERE wo.order_item_name = 'MY ITEM'
		AND wm.meta_key= 'MY KEY'
		AND wo.order_id = $order->id
					");

This will return the meta_value from the table for this item in this order.