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1.
The feeling you get when your principal (or anyone for that matter) tries to be funny and fails miserably and you are a witness.

Similar to Second Hand Embarrassment.

The most uncomfortable feeling ever, it can only be described as "Internal".
Carly: Seeing JohnDoe dance in front of the whole school was the most uncomfortable thing of my life.

Shannon: No, it was just internal to the extreme, I almost couldn't breathe it was so bad.
by xsarahhx12 January 13, 2011
 
2.
On the inside.
Internal bleeding ?
by larstait October 11, 2003