Naarny
A Naarny is the devil's sidekick who shows up when you're about to do something cool. It's like having a trash can for a brain.
'I was about to win the game, but my Naarny made me drop the ball!', my soccer buddy
'I was gonna finish my homework, but my Naarny said, 'Why bother?'', me at 10 PM
'You're just a Naarny in a human body!', my dad when I forgot my lunch again'