Top Definition
The natural reaction of your sphincter to contact suddenly and violently when you are embarrassed by something or —especially— FOR someone else.
"Did you see that TV show with the juggler who was performing for the Queen? Wow, I sure did have a sphincter-blink when he dropped all those balls!"
by Christopher Nisperos June 29, 2006

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

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An involuntary response to an action or stimulus.
I do a sphincter blink every time I hear a car backfire.
by Herb N. Dictionary October 25, 2002

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt