Top Definition
The daily time slot in which you must have some form of caffeine otherwise you will get a headache. No amount of caffeine after this window will cure the headache. A common ailment of coffee addicts who need their morning fix before they can function properly.
Dude1: Fuck, I've missed my caffeine window, I feel a headache developing.

Dude2: Rookie error dude, that's you should always keep a few No-Doze handy when you don't have time to grab some coffee.
by roast beanz June 24, 2011

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

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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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2. A window of opportunity from early a.m. until usually about noon or 1 p.m., in which drinking caffeine is ok. For the recovering caffeine addict who can no longer drink caffeine after mid-morning or early afternoon, lest he be force into some sort of crazy all-nighter bullshit, in which he's either up all night unable to sleep or simply brewing pot after pot in order to generate an next morning mania for work.
Dude 1: I can't have coffee at night anymore.
Dude 2: Oh? Why's that?
Dude 1: Waaaay too late. I'm outside today's caffeine window.
Dude 2: Ha! Whatever...

Dude 1 goes and gets a coffee anyway.
by java bo jangles July 03, 2011

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