Something of an extremely disturbing nature, capable of inducing nightmares or other trauma. This is often something not meant to be disturbing. Popularized by "Mystery Science Theater 3000" and, later, James Lileks.
For some people, that S from Hell is pure nightmare fuel.
by Noah W. Smithee May 11, 2008

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Top Definition
An idea or concept that fuels nightmares or otherwise causes extreme emotional distress. Attributed to James Lileks (www.lileks.com).
Goatse, Lemonparty and Tubgirl are pure Nightmare Fuel.

by Toytown Traveler December 11, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

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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