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Used to clear a stuck round or casing. You kneel down and hold the rifle vertically with the stock toward the ground, holding the foreend with your left hand. Close the bolt over the stuck case/round and then slam, or "mortar" the rifle onto the ground while holding open the release latch on the charging handle. It generates a sudden "jerk" on the bolt that can help pull the stuck case/cartridge out.
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Also, take care to strike the stock squarely. There is a tendency to strike on the toe resulting in breaking off the toe on standard m4 stocks.
And, be very muzzle aware...
ETA Oops, I could have clicked through to pg2 to see that it was already answered- instead of the cut and paste. :)