Most commonly, it means he is trying to time the market by going to cash with some or all of his investment. He believes that the market is going to go down in the near future and that he can then invest the money back in the market.
When our investments go up we feel wealthier and are more likely to spend. That’s not such a bad thing since spending the same dollar amount from your portfolio when it is up means spending a smaller percentage of it than spending from it when it is down.
However, it is important to remember that you’re not really as rich as you think you are in a bull market (but neither are you as poor as you think you are in a bear market.) “Mr. Market” has some rather volatile moods which even out over the long term for the patient investor.