when you have too much sugar so you have a stomachache, you're really tired, and have a headache
i ate too much candy in an hour so i had a sugar hangover real bad.
the undesirable taste in your mouth 30 minutes to one hour following the eating of sugary foods
Person 1: Dude, that brownie batter we ate was so good!
Person 2: Yeah but now my mouth has a total sugar hangover
Person 1: Gross.