A staccato triplet on middle D that is performed by rapidly sliding the thumb back and forth over the hole.   It can be done by starting up or down depending on the situation.  See this following example.

For a real challenge, try it by just covering and uncovering the hole as you would any other time.  You will find out very quickly if you are gripping the chanter too tightly.

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One of the classic ornaments that makes Irish Traditional music sound, well... traditional.

It sounds like this...                           But is usually written like this

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This exercise has proven helpful in building the ability to play staccato over most of the Uilleann Pipes' range.  The staccato technique adds a crispness to scalar runs (especially triplets) and can be used as a great way to vary a tune.  This exercise is designed to be practiced slowly 60-72 beats per minute.  The idea here is not to sound musical while pipping out a scale but to develop a muscular memory that will be ready for use on command when needed.  The hardest part of exercises like this is maintaining mental focus and playing the exercise absolutely perfect.  Remember you are building habits here, do not reinforce mistakes.