Top Definition
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
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
The boringest thing in the world. okay, nini.
Sunday School is as drag. Can i get an amen?!
by angela10198 July 29, 2009

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