woothemes/woocommerce — pull request #3183 by franticpsyx (2013-05-15 13:16:37+00:00)
Title: Order Item Meta values filter

Although filters exist almost universally in WC Core to modify variations/meta descriptions (woocommerce_variation_option_name) before checkout, there is no way to filter this information in the case of purchased/ordered items.

All calls to show order options names/values and other meta keys/values are done through here, so, fortunately, this seems to be the only place to add such a filter.