The act of intentionally bumping another person's shoulder with your own shoulder as you walk past them. It is meant as a display of open aggression or simple disrespect depending on how roughly the shoulder check is performed.
its a term used to put your arm around someone. you start with counting ur far shoulder away from them as one, two which is the closest one to them, 3 their first and 4th the farthest one on the other side and keep ur arm around them