Someone who acts odd or wierd but in a funny way for them. They are different and see things differently. Similar to the word 'waste' or 'wasteman' (see alt. deffinition for more info). Can be used as a prefix to name (see examples below).
1. Person A: I cant believe he randomly turned up at our party. Hes west.
2 Girl: I lashed three boys today
Group: Errrrrr your too west.
3. Apparently Sam is taking meow in lectures. They dont call him west Sam for nothing.
Going west refers to loosing the plot and your grip on reality, such that you are no longer yourself. This will usually result from drug use, although it can occur folling an accident.