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.
When your head connects with your desk. Often used in online chat as an expression of frustration or disappointment.
Person 1: Does anyone know the webmaster's email address?
Person 2: Wutz a wbemastr???
Person 1: ....the person who designed this website...
Person 2: o.
Person 2: Wutz a email adress??
Person 1: ..........
Person 1: *headdesk*