In the theme.liquid template file you find a code line similar to this
{% if current_tags %}{% assign meta_tags = current_tags | join: ', ’ %} –
{{ ‘general.meta.tags’ | t: tags: meta_tags }}{% endif %}
the ‘general.meta.tags’ | t: tags filter is responsible for the “tagged” output. so just replace it like
{{meta_tags }}
if you want a nice solution, this could be a hack
products with {{meta_tags | join: ‘and’ | remove: ’ ’ | replace: ‘_’,’ ’ }}
this populates the meta_tags array with several tag values and removes the ‘_’