the act of hitting your head on a desk from frustration, or pure boredness.
I just head desked myself because I am so bored.
She frustrated me so I did a head desk.
Someone who spend more of their time in lessons with their head on the desk than actually listen/working. Usually due to being in boring lesson like: French,Biology or Music.
Guy 1:Kevin is always sleeping in lessons.
Guy 2:He's a Desk Head.
When you gently place your head on the desk because you cant be asked to listen in your computing class but your teacher screams HEAD OFF THE DESK!
Excuse Me! Head Off The Desk Now!