Prabhupada made up a saying that those who didn’t take to Krsna consciousness were “simply rascals.” He said we should make up a button that says “S.R.” on it, and when we meet someone who doesn’t believe in God or Krsna, we can give them this button and say, “Here, you are S.R.” Sometimes Prabhupada referred to someone as an “S.R. Man.” This was our inside language.

From “Meeting Srila Prabhupada” by SDG