One who lives in Belmont Hills, a suburb of Philadelphia. Usually a hiller can be defined as a racist, football playing, beer drinking, back-road hick. They're usually quick to insult other ability to play football, ability to drink beer, or manhood. You can usually find a hiller at Belmont Hills park playing football, smoking cigars, or drinking beer.
"John's such a hiller, he had his first beer at the age of 9.....9 months"
Hiller: "Cut your hair you woman-looking idiot. No wonder why you suck at football..."