The act of slamming one's head into someone's nuts while yelling "Oh my GOD, why are you smacking your nuts into my head, man?" This is done while someone is awake but otherwise occupied doing something and is not aware that you are approaching for the meat packing.
Established in Farmington Hills, MI, hence the moniker "Michigan Meatpacker."
I was laying on the couch studying for my econ test when Matt slammed his head right into my nutsack screaming "Christ on a side Car, Sam! Why are you violating my forehead with your balls, you ass wodge?" "WTF?!? You're the one giving me the Michigan Meatpacker, you douche bag!"