2. The condition of a situation emulating a television sitcom, especially by means of cheesy romantic actions. A 'Nick at Nite' moment is one that has been employed a thousand and one times in every TV show imaginable, and yet people continue to do it because, well, it's been employed a thousand and one times. Can evoke positive feelings in a person while simultaneously making them feel sick due to an OD of classic cheesiness.
2. After her crush won her a stuffed animal at the carnival, Jessica couldn't help but think "Man, that is so Nick at Nite!".