A revulsion to a particular food or food provider.
Server: You want sour cream on that?

Jim: No! I have a gastric allergy to sour cream.

Ken: I'd love to go to Chipotle's for lunch today, how about you?
Sam: Not today. I've got a gastric allergy to Chipotle's right now.
by UR-GODZ August 20, 2015
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