Back during the depression, people worked a 12 hour shift in the cotton mill. They had to stay at their job even during "breaks". So, they had a fellow running what they called "the dope wagon". He had snacks, cakes and drinks on the wagon but if you wanted hot coffee, he had to go get it. When ever he returned with the coffee he always had his thumb in the coffee. One fellow, like our DUmmie here, got tired of him sticking his thumb in his coffee. He said something to the man running the dope wagon and one word led to another. Finally the guy told the fellow he did it because he had arthritis and the doctor had told him to keep his thumb in something warm and moist. The disgruntled customer then told him, "Well then, why don't you stick your thumb up your ass". The dope wagon operator said, "I do when I'm not carrying coffee."