A coworker had never heard of this, and I couldn\'t provide a real definition. For me, it\'s always been an instance of \'I-know-it-when-I-see-it\'.
Bonus question,
You can refer to it as "snippets" or more accurately "collection of snippets" . The term I think was coined from the press and printing industry, where they used actual "plates" and then re-used them as chunks again.. In modern-day internet it is a part of an ongoing (annoying IMHO) trend of using fancy terms for simple things in order to look more trendy and sophisticated . see RESPONSIVE = adaptable / fluid.