If you sit down with another member of the Drupal community in a cafe to hash out something, then you are with... a friend (hardly, you might barely know each other)? a colleague (doesnt that mean that we are working at the same place)? associate? I am afraid that an open source community being such a new thing it needs a new word. Fellow Drupaler -- sure, try to say that to the average Joe and watch the glassy eyes :) And how do you explain to the average border guard that you are traveling to a code sprint...? A GSoC mentor summit?