Drill Rush (formerly named the "Triple Dash") is the name of Meta Knight's Forward B attack. Seen in this screen shot and several times in videos posted outside the Dojo, Meta Knight leaps sideways with his blade outstretched. If he hits an enemy, he performs a combination lasting up to a good 2 seconds, knocking your opponent upward. Also, when finished, he pulls back a bit. Meta Knight can also change the course of the attack, as he is shown using the same attack upward, allowing it to be used as a recovery. After using the attack, Meta Knight becomes helpless. It is possible to cancel the ending lag of the attack by making the end hit the edge, allowing it to be virtually lag free, and allowing it to be used to rush opponents in such stages as Battlefield. This is known as Drill Rush Canceling.
Of all of Meta Knights recovery moves, this move gives the most vertical distance of any of them.
Origin
It may be derived from Kirby's Running-B move when he has the Master Ability (which he has when he uses Meta Knight's sword) ability in Kirby and the Amazing Mirror. It also somewhat resembles the barrel roll he does for a Quick Spin attack in Kirby Air Ride.