A mental state of high arousal caused by anxiety, fear, panic, surprise and/or confusion, or substance abuse. A person experiencing the "deer in headlights" syndrome often shows behavioral signs reminding those of a deer subjected to a car's headlights, such as widely opened eyes and a transcient lack of motor reactions.
Mike doesn't like cars; he's like a deer in headlights when he goes to his driving lessons.
When you accidently lock eyes with a bro taking a dump in the woods, and then you dream about him sexually.
AKA: The Brokeback Outhouse
Randy wanted to remain drinking buddies, but after the "Deer in Headlights," Doug just couldn't do it.