d-bits
A kid who's learning how to be a total tool. They're like a mini version of a real-life tool, still growing into their douchiness.
My son is a d-bit. He calls me 'daddy' and says 'you're cool, but I'm cooler.'
My little brother is a d-bit. He thinks he's the king of the school.
My cousin is a d-bit. He thinks he's a rockstar just because he has a guitar.