Macro means doing something on a huge so maybe it represents doing SEO to a band of sites . Small is compared to macro and it indicates a small which might consult doing SEO to one web page accross search engine.

Macro SEO means optimizing your site with minimum words.

Macro SEO means optimizing your site with minimum words. Like twitter is also macro blogging.
Promoting the multiple sites at once is called as macro SEO.

A macro SEO is a set of tasks combined together so that you can run or replay the entire task together with a single command. Macros are a powerful productivity tool. With macros you can perform long or boring tasks just by a single click.

A group level search engine optimization technique to promote a number of websites together for one or more keywords.

As per my knowledge "Macro SEO" is the services of group of website promotion it is the promotion methods for one or many search engines to use of targeted the one or more keywords easily.