shoulder-check 

The act of looking over one's shoulder, for a second glance at someone who caught your eye.

Dude, that girl just shoulder-checked you; why don't you say, "Hi"?

shoulder-check by Turncoat August 3, 2009

shoulder check 

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.

Janet shoulder checked Denise on her way out, hoping for a fight.

shoulder check by Miami Mistress November 30, 2009

shoulder-checking 

When two strangers bump shoulders while walking past each other as a result of neither being aware or courteous enough to move, or simply not having enough room to do otherwise.

Amanda was trying to get to class, and ended up shoulder-checking people in the hallway as she hurried to get there in time.

shoulder-checking by J_Dawg November 12, 2013