A sexual act in which (having taken a laxative and eaten lots of corn for lunch) one defecates in their partner's mouth.
Troy: "I heard you and Shirley hooked up last night."
Pierce: "Yeah, she's a freak. She gave me a Nebraskan Nightmare. Best lay in years."
Pierce: "Yeah, she's a freak. She gave me a Nebraskan Nightmare. Best lay in years."
by hectic_scone October 28, 2021

Someone sent from the afterlife to destroy your group,club,secret cheerleader squad or possibly your organs. You go on your missions , raping, stealing, killing,lying etc. This person is the ultimate deciever and master of manipulation and is usually seen as handicapped , dumb, weak. But that is how it they want you to think about them.. They are very dangerous, but can sometimes decide to just destroy you instead of your entire gratto. They only thing you can do is wonder how they done this. Then you will hear a song getting louder. Wake up Dead by Megadeth .
Wiseman:1 I told you all not to provoke that one.He is your Worst Nightmare
Duck hurter: But he is the sister to Groot..I hate Groot .
WorstNightmare: Gee Whiz you are the sex offender who like kids? How's your wife or ex wife? How's your Job going? I like you buddy.I'm not too smart like you are.. don't forget your blood work.
Duck hurter: But he is the sister to Groot..I hate Groot .
WorstNightmare: Gee Whiz you are the sex offender who like kids? How's your wife or ex wife? How's your Job going? I like you buddy.I'm not too smart like you are.. don't forget your blood work.
by Mrs VAL June 15, 2022

Doing something that causes you not only to shit your pants, but also to piss, vomit, cum, spit, and bleed into your pants.
person 1: Hey did you see how steep that double black diamond was?
person 2: yeah, it caused me a fluid nightmare.
person 2: yeah, it caused me a fluid nightmare.
by wooden man May 10, 2012

The disapointment felt when woken up by a blowjob only to look down and realize it is being administered by your uncle.
by Micro67 May 8, 2010

When your mental health is affected.
When you feel like you can’t sleep or think straight.
And when you want the racing thoughts to but they keep coming back.
When you feel like you can’t sleep or think straight.
And when you want the racing thoughts to but they keep coming back.
A boy is having trouble dealing with everyday life because he his so anxious and so frustrated, beyond to point of no return, he feels that he believes that life like an Endless Nightmare.
by Drago Nino January 22, 2023

Unexpected dissapointment. When an expected positive outcome turns out to be exceptionally negative. Refers to an awful sour tasting beer much like salad dressing, disguised as something delicious. It costs $36 a bottle, and tastes like $2 vinegar.
Last night was a real Blueberry Nightmare ....
When I finally got her pants off it was a real blueberry nightmare down there...
When I finally got her pants off it was a real blueberry nightmare down there...
by ianelectro March 18, 2013

Nathali: "Look at these math and science textbooks from Grade 7 and 8"
Mounir: "Wow, that literally gave me nightmare nostalgia"
Mounir: "Wow, that literally gave me nightmare nostalgia"
by waterwaterwaterloolooloo March 4, 2021
