I'm no psychoanalyst, but I'm thinking he just 'Googled' ACS and will post the results like this thread!
Then we should expect threads shortly on the American Chemical Society, American College of Surgeons and the American Cancer Society. We are more likely though to get a thread on how much our backsides perspire. ACS - Ass Crack Sweat. Definitely a much more appropriate user name for him as well.