look up any word, like smh:
 
1.
A racial term for an illegal Mexican immigrant. It originated from the myth that Mexicans crawl under the U.S fence to get into America. In the proccess, their backs get scratched from the fence. (Also, see "wet backer")
The darn back scratcher came here just to pick strawberries?!
by Hoon Da Bar July 16, 2005
 
2.
your girlfriend during rough sex.
"Carolina is a back scratcher"
"you must have been working her hard"
"hell yeah man, hell yeah"
by A2K February 20, 2003