A caffeine hangover, specifically the feeling you get the day after having a bottle of nos or an otherwise large amount of caffeine
Dude I have the worst nosover this morning, this headache just won't go away. I can't believe I had 3 bottles of nos at the movies last night.
A caffeine overdose, specifically the feeling you get from ingesting an entire bottle of nos energy drink
Man, I totally nosverdosed after having like 3 bottles of nos and 2 monsters last night at the movies. My leg wouldn't stop twitching the entire time and I didn't get to bed until 6 am! I still feel wired!