ANSWER
I assume that it's something that Joe made up as a story for us taking this person away to avoid saying to this person we've been sent here to abduct him, I think it's something that he fabricated himself by saying to this person "we want our money".   This girl that was there should be under the impression that he owed us money and that is why we came to fetch him and not think that we were police who had come to abduct him.