When you're so hungry you'd be willing to turn cannibal. (Like in the Donner Party from like.. 200yrs ago in the US or something)
Kid- MOOOOOM! I'm hungry!!! Can we hurry up and go home already??
Mom- Sweetie, I need to finish getting these groceries!
Kid- But MOOOOOOOOM...
Mom- Well.. Exactly how hungry are you? Can't you wait? :/
Kid- No way!! I'm almost Donner Party Hungry! >,<