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2.
Someone who is "all there" in a mental sense but not necessarily in a physical one.
Steven Hawking is totally screwed on man.
de Simon Batt 12 janvier 2005
 
1.
Opposite to someone who has a screw loose i.e a bit dopey.
You obviously had your head screwed on while you were tackling that piece of coursework.
de Simon Batt 13 janvier 2005