Short for "Scrum-half", which is a Rugby union position. The scrummie's job is to choose how and where the ball will be played in each phase of play and take control of the ball from set pieces (lineouts and scrums), rucks and mauls. Comparable to the quarterback in American football.
The small pieces of marajuana that fall in the cracks of your coffee table, couch, etc. These are only to be smoked when extremely desperate due to the fact that these are usually found around other items that would be deemed disgusting, and due to the fact that they are stale old and covered in dirt.