Intimidation and Taunt allow a character to make a “Test of Wills” attack against an opponent. In combat situations or during competitive miniature battles, Tests of Will have objective effects, as seen below. More subjective effects are determined by the Game Master in roleplaying situations.
To make a Test of Wills, the character makes an opposed roll against his chosen target. The defender uses Smarts to resist Taunt, and Spirit to resist Intimidation.
The Game Master should modify both character's rolls depending on the situation. Waving a gun in someone's face isn't polite, but it's definitely worth a +2 bonus to Intimidation, for example (unless the target has an even bigger gun!).
A success means the attacker gets a +2 bonus to his next action against the defender during this combat. A raise on the roll gives the attacker the bonus and makes the defender Shaken as well. This can be a great setup for an attack, a trick, or even a second Test of Wills if the first one didn't get a Shaken result.
Savage Worlds Deluxe Edition p. 86