Learn to craft your current situation into a clever pun. For example, a person who is getting smart somehow gets doused in ice water. It would then be your job to inform the person to "chill out." These corny tough guy one-liners are the stuff of Schwarzenegger legend.
Deliver dialogue in a calculated, even tone. In all cases but a few, Arnold's strength and flawless self-confidence dictated that he did not need to yell and scream to get his point across.
Accompany the toughest and most hard-hitting comments with an icy-cold glare and disgusted sneer.
Be ready to rebut any trash talking with a quick retort. This may just mean repeating the same threat, only redirecting it toward the trash talker. Look to the hotel fight scene in Commando for an example of this technique at work.