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.
লিখেছেন- Simon Batt 13 de জানুয়ারি de 2005
1 more definition
Someone who is "all there" in a mental sense but not necessarily in a physical one.
Steven Hawking is totally screwed on man.
লিখেছেন- Simon Batt 12 de জানুয়ারি de 2005