Disorientated is the British spelling/pronunciation (originally from a French word) of the US slurred and lazy variant disoriented. Meaning: Confused. To lose one's sense of direction.
It appears in all English dictionaries (as opposed to US-English) and the word has been in use since (at least) circa 1704.
Whilst walking around the numerous corridors of his new college, George became disorientated and couldn't find his way back out.
"I met a family recently who had been caught in a huge avalanche and when it stopped they were completely disorientated and had no idea which way was up and which way was down."