If someone lives out in the boondocks (also boonies), it means they live in the middle of nowhere. It’s generally an American term (the British equivalent is probably ‘the sticks’) and is usually used in a derogatory way to mean somewhere that’s considered backward or dull, AKA the basis for many a disturbing redneck-based horror film.
While boondocks might be a more popular word in the US of A, it didn’t originate there. It’s actually a term from Tagalog, the language that’s the base for Filipino, one of the official languages of the Philippines (obvs). That word is ‘bundok’, which means ‘mountains’. So how did it get from southeast Asia to Murica? Well, during the Philippine Revolution of 1896 to 1898 (when the Philippines fought for independence from 300 years of Spanish colonial rule), occupying American military forces adopted ‘bundok’, broadening its meaning to refer to the wild and remote country they found while fighting abroad. They then took it home with them as ‘boondocks’.
Tagalog is spoken as a first language by the Tagalog people (again, obvs), who make up a quarter of the population of the Philippines, and as a second language by almost everyone else who lives there. Taglish or Englog, a mixture of Tagalog and English is also widely spoken. In fact, it’s so prevalent that non-native speakers can be identified easily because they use pure Tagalog, whereas native speakers speak Taglish.