You may have heard the phrase hair trigger temper referring to someone who reacts strongly when angry. As an adjective hair trigger has been described to mean “easily activated or set off; reacting immediately to the slightest provocation or cause”.

What is the point of a hair trigger?

: a gun trigger so adjusted as to permit the firearm to be fired by a very slight pressure.

Do hair triggers make a difference?

While there's no way to add paddles to the back of the controller, in our testing we found that the hair triggers make the most difference. ... Many gamers only prefer hair triggers so this is definitely an accessory to keep in mind.