A salesbag is someone who typically works for a boiler-room pump-and-dump stock brokerage firm and cold-calls people at home.
Salesbag: "Hello Bruce, this is Dave Savinelli from Bluestorm Securities calling to let you in on the deal of a lifetime. For just ten thousand dollars, you can get in on the ground floor of a company that is going to surpass Google in annual revenues by the year 2013."
You: "I follow the Mayan calendar, Salesbag. Looks like that company will still be in the shitter when this world goes South."