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.
Someone who is "all there" in a mental sense but not necessarily in a physical one.
Steven Hawking is totally screwed on man.
The creme de la creme of twazzocks. Derived from the word twazzock and god. Basically the ultimate twazzock in the whole universe.
Its nothing to be proud of. If you dont like it you can kiss my choad
"Hey you! You're a big fat godazzock wearing that size 42 miniskirt!"
(Boyfriend appears you end up with two black eyes a broken nose and a free ride in an ambulance).
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