Top Definition
A username, for the internets. The most rarest of all usernames, too. Only a handful of people use this name. And people whose name is "Nightmare-Box" is most likely a bisexual, teenage, cross-dressing, male weeaboo from North America with nothing to do. A "Nightmare-Box" will use CAPS LOCK when showing affection through the internets. They have a strong obsession for YouTube, 4Chan, and Anime Conventions. They hate MySpace and love cosplaying.
Allan: Are you going to Acen 2010?
Joey: No, you?
Allan: Well, duh. I'm gonna cosplay as Sasuke.
Joey: He's stupid.
Joey: God, you're such a Nightmare-Box.
by Just Lexii April 14, 2010

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