When you've been wearing over-the-head headphones on big hair, like an afro, for some time, part of your hair becomes much lower than the rest. Now you've got headphone hair and may or may not look weird.
After wearing my headphones in my sleep, I woke up with the worst case of Headphone Hair.
When you sculpt your hairstyle around the on-ear headphones your wearing. The effect of such hair is ruined when the headphones are removed.
Subsequently, you look a bit of a penis.
"Your facebook photo has some good use of the headphone hair"
"Skullcandy are shit. But kudos on the headphone hair."