Green’s Dictionary of Slang

boondock adj.

(US) rural.

1950		Word Study Oct. 7: Today Marines use boondock clothes and boondock shoes for hikes and maneuvers [W&F].
1965		H. Rhodes Chosen Few (1966) 73: He borrowed Ballard’s short las’ night and brought it back fulla dust. It looked like boondock dust.
1979		‘Iceberg Slim’ Airtight Willie and Me 205: Gigging in boondock clubs for a lousy bill or two.