McShank

The act of holding your straw like a knife and then shanking your buddy's large McDonald's cup on the side in an attempt to make a huge mess. This only works with the large cup since it's the only one made out of styrofoam .

What you call a big scary guy who lives in a small town in the country, likes shanks and guns alot, calls people 'jerks' and often roams the surrounding forests at night, looking for victims. Such a person may also flick a phantom shank at you, or maybe even a real one.