When copious amounts of pizza have been consumed too close to bed time, thereby dehydrating you as you sleep and rendering you feeling hungover the next day.
A: You look like ass today man
B: ...Yeah I slept like shit
A: Pizza hangover?
The result of staying over at a friends house all night, eating pizza, drinking soda, and playing video games to the extent where you cannot move your arms out of the video game playing position that afternoon when you decide to get up. If arms are attempted to move out of the video game playing position, it will result in extreme discomfort. The length of a pizza hangover varies with each case.
I woke up with a pizza hangover
and could not move my arms to get the leftover pizza to my mouth,