The
act of greeting someone by gently squeezing (and hence exciting, and possibly putting a smile on) their
nipple. Usually followed by a wink. Not recommended for greeting someone of the opposite
gender, but results do vary.
Every time I see
Billy, he nippleshakes me but I
never get the time to do it back because I would lose all my senses for a couple of seconds.
James tried to nippleshake that girl he had a crush on. He thought it would have a similar effect to when I do it to him. He was wrong.
Now he has a bruise on his right cheek to tell the story.