Top Definition
Taking 30 seconds to think before you say anything, because 99% of what you say right away is stupid.

This is most commonly used in the World of Warcraft.
"Raloth, 30 second rule!!!"

"Shut up Raloth, 30 second rule!"
by Valjean September 15, 2008

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In the case of not knowing exactly how long to keep smaller portions of food in a microwave oven, the general rule of thumb is to tap the "+ 30 Seconds" button on your microwave.
How long should I put the quesadillas in for?" "I dunno, 30 second rule?
by Frohman23 September 06, 2010

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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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