The non-medically defined syndrome which results from spending long periods of time in great isolation (such as in a work camp in a remote location).
Since the majority of personnel in said camps are generally male, and thus there is a lack of female presence, males tend to long for sexual relations, resulting in frequent use of very crude and lude jokes and sexual innuendos.
People displaying the bush crazies may also think that everything is funny, be very irritable, and act very immature (associated with the fact that they find everything funny).
The symptoms tend to overlap with those of cabin fever, except for "feeling the need to go outside frequently" since workers tend to spend long hours outside performing various types of physically demanding labour.
After spending a 6 week period in the remote Selwyn Mountains of the Yukon, Johnny developed an extreme case of the bush crazies.