Used primarily by urban gangsters in northwest England, to “smack a dollar off” refers to a classic pimping control technique in which said pimp will beat down his whores should they step out of line
1) “Hey Jonas! I don’t like how you be treatin me lately”

“Bitch you better get your skinny white ass back inside or I’m gunna’ smack a dollar offa you!”

2) “Kaleesha, Ashanti, leeara, you better pray to God all the money be here honey or I’m gunna’ start smacking dollars offa’ yal”
by Dr. Robotico June 3, 2011
Get the Smack a dollar mug.