Sunglasses that someone keeps on at inappropriate times, such as during a group lunch or dinner, while talking with one person about a serious topic, or in any indoor venue. One wears shunglasses to shut out other people.
Amit: Something's bothering me that I want to talk to you about.
Soren: Ya man, shoot.
Amit: Take off your goddamned shunglasses, asshole. This is serious.