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1. Literally, where unfortunate kids get packed off to on Sunday to pretend that they're learning something, either so Mom and Dad can worship in peace, or so Mom and Dad can take the morning off.

2. adj. Prudish

3. adj. Totally naïve.
Those kids in Sunday School (1) are so Sunday School (3) that they don't even know what to be Sunday School (2) about.
by Downstrike September 27, 2004
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A prison in which children do penance for the evil conscience of their parents.
- American editor and critic H.L. Mencken
by Sigma February 01, 2005
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