Top Definition
The feeling of heaviness and/or sleepiness after eating a very large meal.

Usually occurs after dinner and results in a good nights sleep.
1.After eating her large meal, Margie felt the effects of kitten syndrome coming on, and prepared to go to bed immediatley.

2.Paul: Dude I ate such a large meal, and now I feel that kitten syndrome coming on.
George: You'll be sleeping well tonight
by taytay1212 June 03, 2011

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