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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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
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The remains left in the toilet after a violent session of "spray and pray", Induced by daily work cafeteria food.
"Hey Nick, I am going to go Blast some nightmare fuel into the king's throne. I'll brb."
by Catphart May 11, 2021
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Some really fucked up images that will forever haunt you for the rest of your life. The spawn of satan's mind after being tourtured by constand Hannah Montana courtesy of God.
Just google image it... I DARE YOU.
High octane nightmare fuel refuses to let me sleep
by Tarken Destroyer of Worlds October 04, 2010
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The remains left in the toilet after a violent session of "spray and pray", Induced by daily work cafeteria food.
"Hey Nick, I am going to go Blast some nightmare fuel into the king's throne. I'll brb."
by Catphart May 11, 2021
Get a Nightmare fuel mug for your guy Riley.