From this link, I found the word to be "the Itis".
Is there a synonym for this word?
"I got the worst case of ______ after that cheese steak with fries".
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Post-prandial somnolence, post-prandial sleepiness, or post-prandial fatigue. (The hyphen is optional.)
Postprandial somnolence (colloquially known as the itis, food coma, after dinner dip, or postprandial sleep) is a normal state of drowsiness or lassitude following a meal.