When you're looking at something while sitting, a friend comes over to stand right behind you with his crotchal region at shoulder height, and, possibly touching you with his package.
It must be stopped.
"I was looking at hot chicks on the interweb and Bryan comes over and puts his junk right on my shoulder. He totally shouldercocked me!"
A story told by someone in which they discuss their crush. The story is long and plotty, and the end is something along the lines of "and then...he touched my shoulder!" - a moment clearly exhilerating for the person telling the story, but that leaves the audience confused and expecting more from such a long winded story.
"so we went to the park on friday after the movies, and we were walking around and he bought us all ice cream from some random crazy vendor named frank, and then we were talking about his new car and its red, and then he touched my shoulder!"