1. noun
a) A portion of a culture distinguished by its customs or other features.
The goth subculture has its own mode of dress, and it has a characteristic musical style.
b) A culture made by transferring microorganisms from a previous culture to a fresh growth medium
Like those activities, bodybuilding is an obsession, a living (for a few), and a way of life for the people involved in it—a subculture, in a word, with its own values, aesthetics and vocabulary.
2. verb
To transfer (microorganisms) to a fresh growth medium in order to start a new culture
Wikipedia foundation.