A term usually used by an extremely drunk alcoholic on the verge of falling over to tell somebody else trying to chug a drink that they're a bitch and can't hang.
Originating in Glasgow, Scotland "night night patter" is when you get to that part of the night when everythingthat's not funny becomes hilarious, all whilst needing no explanation. Night night patter is usually paired with illegal substances such as acid, ketamine and alcohol.
Night night patter in itself cannot be fully defined, however here are some examples I have come across.