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1.
eating so much that you get a stomach ache and feel shitty
Lindsay: oh dude, i ate so much food during class. i feel like shit.

Steph: Damn, you must have one hell of a food hangover
by kornkiddz March 07, 2006
 
2.
The feeling you get when you eat too much
Example: at a buffet and u eat 7 big plates after you go to leave and you can barely move "oh gosh I have another food hangover "
by Mich3093 December 20, 2013
 
3.
Accuring after a food party (Party where you binge on food not alcohol) or just eating large amounts of junk food, you will get high of sugar or protien then crash into a food Hangover. Food Hangover symptoms are vomiting, head aches, and other unpleasant side effects to eating delicious food. The more extreme version of a stomach ache.
Friend 1: Hey, are we going back downtown?
Friend 2: No! I have the worst food hangover.
Friend 1: I thought you were off the sugar!?!
Friend 2: I can stop at any time!
by NikkiNicki August 19, 2010