d(=^_^=)b
A person who thinks they're the best because they're wearing headphones and pretending they know what they're doing.
He's d(=^_^=)b and he thinks he's a DJ.
This guy is d(=^_^=)b and he's just pretending to listen to music.
She's d(=^_^=)b and she's pretending to be cool.