no no, I must correct you sir. The line, "Chill out dickwad", is from T2, when John Connor is attempting to teach the Terminator how to be more human, and he starts saying different things, two of them, "Chill out!", in regards to a response to be used if someone is getting upset, and then "Dickwad", for if someone's being an asshole. And then he tells the Terminator "Or you can use combinations." to which the Terminator replies, "Chill out, dickwad." This same scene is also where his famous catchphrase, "hasta la vista, baby", is first used in the film.
Whew. Sorry to ramble. Terminator 2 is just one of my favorite movies, I've probably watched it over a hundred times.