The odd phenomenon of your hair looking its very best just before you go to bed. Cousin to "oh no haircut hair," the even odder phenomenon of your hair looking absolutely perfect on the very morning of a haircut appointment.
He stumbled into the bathroom at midnight only to discover, as usual, that he had Good Night Hair.
The short, sharp clicking “Chk” sound that one makes out of the side of one’s mouth by rapidly sucking air into the space between the teeth and the side wall of the mouth. Usually accompanied by something of a wink and (less often, but significantly) by a thumb/index finger mock-pistol engaged in firing. The Chlick is most commonly used to emphasize an odd point that the Chlicker just made.
He ended his strange statement with a chlick, complete with a wink and finger-pistol shot.