The most kick-ass character in the film Kick-Ass. Played by the very talented Chloe Grace Moretz, she's a pint-sized, fowl-mouthed 9-year-old superhero who, with the help of her father's training and her advanced experienced with elaborate weaponry, kicks some serious bad guy ass.
Kick-Ass: "How do I get a hold of you?
Hit-Girl: "You just contact the mayor's office. He has a special signal that shines in the sky; it's in the shape of a giant cock."
Hit-Girl (to the drug-dealing villains): "Ok, you cunts. Let's see what you can do now."