At a loss of time. Usually happens when either dumb, drunk, high, well-sexed, post-comatose, or cerebrally traumatized. Usually leads to negativeconsequences...
I was boffing my secretary so hard that I became temporally disoriented and missed my 3 o'clock.
Me and Rob got spliffed and, in a classic example of temporal disorientation, forgot to meet up w/ my hook up for another bag.
Disoriented is the American English version of it's more clunky sounding British English counterpart: disorientated. They both mean to be confused, lost, or to have lost ones bearings or sense of direction.
To have sex with a girl on the beach, and cum in her face aiming mostly for her eyes. You then throw some sand in her face and push her over. Leaving her "Lost and Disoriented"