Any situation that escalates to a level that is almost beyond comprehension against one's favor. Normally, inserted after a ridiculous story/description. If, by chance, an explitive is used as an adjective prior, it can be a way to measure the severity of the incident.
"Last night when I was out downtown everything went wrong: I lost my wallet, a guy beat me up, a homeless guy peed on me, and then some chick blue balled me... Fucking Nightmare"
"I am not a White Protestant in America... Nightmare"
"Wow I am out of beer...What a Nightmare"
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