A term used to describe a situation where one needs to smile or act happy even though they are in severe pain physically and or mentally. References how dogs (most dogs) facial expression remains the same even when they are in pain. Usually used to describe an unpleasant interaction with authority.

Another variation of this phrase is shaking like a dog shitting razorblades
"The boss was screaming right in her face but she just stood there smiling like a dog shitting razorblades."
by FutureGhost November 13, 2018
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