When someone wakes up from a long, restless nap and gets pissed off at everything, often swearing and throwing pillows at other humans. That someone has nappers rage.
(Samwise gets pissed at Malcolm after a restless nap)
Malcolm: "Samwise calm down, man, you have you have nappers rage"
Samwise: "No I f***ing don't!" (violently throws pillow at Malcolm)