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!"
Forcing someone else to carry out your duties/tasks, or ignoring someone who depends on you in order to perform his or her duties/tasks.
Oren told Rick yesterday that I'll pick him up from the hotel. He didn't tell me anything about it, and I just leaned about it on my way to the office. He totally shouldercocked me!!!