He is talking about the MA50 and MA200. In order to get a true reading it is necessary to look at them both. Just because one is going done and the other up doesnt mean the stock is a buy or sell.
In the last 200 days if the stock average is going down, the average of the past 50 days can be going up and indicate a buy. Also, if the average over the last 200 shows a steady increase, a slight dip in the MA50 may not indicate a sell because history has shown the upward trend.
In addition, the MACD DI+ (green) pointing up can indicate a buy also.