Top Definition
That feeling you get when you've had too much coffee in the morning and it's starting to wear off. Its stimulative effects don't always wear off evenly, leaving you feeling jittery AND exhausted. Food and water help; fortunately the most common time for a caffeine downer is right before lunch.
"Anyone want a second cup of coffee?"

"I'm tempted, but I'll get a caffeine downer in an hour for sure."
by Trinadtsat Tomitsu August 24, 2007

The Urban Dictionary Mug

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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.

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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

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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

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