Deriving from the combination of the English slang term for nothing ('nowt') and the word head, as in, I have a pain in my head. Nowt-head is a descriptive term to identify someone without purpose or goal. Usually used as a derogatory term but not exclusively as one can describe one's self as a 'Nowt-head'
'stay away from that lad he's a proper nowt-head'
'I can't believe I have missed the bus to that job interview because I was masturbating, what a nowt-head I am'