reference to hand jobs or masturbation. In the United States and Canada in the late 19th and early 20th century, the occupation of laundry worker was heavily identified with Chinese Americans. They were known for doing laundry "By Hand"
"Man. old boy ain't gettin' no play from his girl!"
"Really? Not even Chinese Laundry?"
"Is Lou comin' out with us tonight?"
"No, he says he has to stay in and do laundry..."