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'
When you give your partner head and their orgasm is so strong, they are temporarily unable to see straight.
I was eating my girls ass out while rubbing her pussy and she came so hard she couldn’t see for over a minute . She was so happy she said, “damn babe, that was that lasik head”.