That bigass bundok is in the boonies.

Boonies, short for boondocks, usually refer to someplace remote or rural . . . like where I grew up . . . waaaaaaaaaaay out in the sticks. 

The origin of 'boondock' is simple and straightforward but interesting, nonetheless.

The word was adopted by American soldiers during the Spanish-American war.  The soldiers were deployed deep into the forests and mountains of the island . . .  or the bundoks, as the indigenous folk would say . . . ambushing the enemy and fight small concentrated battles. 

‘Bundok’  became boondock and thus became a part of conventional vernacular.