Top Definition
The ability to cause heads in the immediate vicinity to explode. This includes one's own head.
In Jhonen Vasquez's comic, Johnny the Homicidal Maniac, the main character 'Nny visits Heaven, having beeen denied entry into Hell. While in Heaven, 'Nny learns that, like all behind the pearly gates, the ability to explode people's heads has been conferred upon him. Very messy antics ensue, preceeded by an exclamation and a blood-thirsty grin, "I have Head Explody?!"
by Chris N. September 11, 2006

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An intense headache.
I'm going to grab some tylenol and lay down till the headexplodies pass.
by Black August 19, 2003

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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Originates from Invader Zim. When Gir (or anyone) has such a revelation, or stupid moment that they feel that their brain may explode from stupidity.
Simon: What is a dialog box?
Me:... are you serious? I think i'm going to suffer from head explody!
by Bill Eburn April 20, 2005

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.

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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).

Buy the t-shirt