to be separated.
a reference from Harry Potter, when someone is splinched, some part of their body is split apart because they did not apparate correctly.
Spinhead - Someone who is being weird, talking shit and not making any sense almost like they are still hammered from a busy weekend on the sesh. Or could be used anytime someone is acting strange like wearing slippers to the pub.
Eg. 'Why are you rolling around on the floor, youre such a spinhead'
Or
'You are such a spinhead, why are you talking about doing ket on a monday.