My mom's friend--60ish--went on a trip to the American Southwest and exclaimed, "It's so weird, they have all these places with 'butt' in the name!" People in the Southwest probably get that a lot.
FTR, the word is "butte" as in Butte, Montana or Red Butte or Elephant Butte. It's pronounced byoot, like if you were saying "beautiful" but just used the first syllable. It's a geographic feature, one of those iconic straight-sided, flat-topped hills they have in the American West and Southwest. Personally I would expect an adult American to have picked up on that by now, from the movies if nothing else.