Grindhouses and Drive-ins
Grindhouse is an American term for a theater that mainly showed exploitation films. It is thought to stem from the defunct burlesque theaters on 42nd Street, New York, where "bump n' grind" dancing and striptease used to be on the bill. In the 1960s these theaters were put to new use as venues for exploitation films.
As the drive-in movie theater began to decline in the 1960s and 1970s, theater owners began to look for ways to bring in patrons. One solution was to book exploitation films. Some producers from the 1950s to the 1980s made films directly for the drive-in market, and the commodity product needed for a weekly change led to another theory about the origin of the word: that the producers would "grind" films out. Many of them were violent action films which some called "drive-in" films.
Read more about this topic: Exploitation Film