What is this?

I'm a rookie programmer trying to get into Javascript, but for the life of me I can't understand what is this?

If this is something simple I will feel bad. Hopefully this will be easy to learn. I don't know why this is so complex.


function Anus() {
  this.is = "haxxed";
  this.hax = function(){alert (this.is);}
}

var MyAnus = new Anus();
MyAnus.hax();

I hope this sample code will enlighten you.