A hangover from drinking too much beer.
Derived from the words "beer" and "hangover". This is a specific type of hangover most noted for the following symptoms:
Fat, bloated belly
Flatulence
Severe dehydration
Puffy face
It differs from other hangovers in its severity, its body-changing effects, and especially the dehydration.
"I hate beerovers. I'm always so dehydrated. Why can't I just drink vodka instead?"