cari istilah yang lo mau, kaya' blumpkin:
 
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.
dari Simon Batt Kamis, 13 Januari 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.
dari Simon Batt Rabu, 12 Januari 2005