suche ein beliebiges Wort, wie eiffel tower:
 
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.
von Simon Batt 13. Januar 2005
 
2.
Someone who is "all there" in a mental sense but not necessarily in a physical one.
Steven Hawking is totally screwed on man.
von Simon Batt 12. Januar 2005