Nog was an alcoholic beverage. After Cassian Andor killed two Corpos on Morlana One, he went to his friend Brasso to create an alibi for the situation. Part of the fake cover story was that Brasso had a bottle of nog at home and they went there and drank themselves to sleep, with Brasso adding to the story that Andor insulted his choice of beverage and got aggressive, before passing out from the alcohol.