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A facial expression resembling a strained, or forced smile, usually resulting from an embarassing moment, or an uncomfortable situation.
Pooper had the biggest pain smile when Sharon rejected his overt sexual advances.

Ed's pain smile could be seen for miles after he was caught "waxing on" and "waxing off".

Paul's pain smile was quite evident when he was asked to pick up the bar bill.

When the bouncer confiscated his fake ID, all Joe could do was shrug his shoulders, put on a pain smile, and walk out the door.
by Bullet Bob July 26, 2006
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