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1.
The State of the Union address given each year by the President of the United States. From POTUS (President Of The United States) + Interruptus ("Interruption")

So named due to the modern practice of the attendees to stand and/or applaud at every other sentence which contains a statement or policy initiative favored by one party or another.
American Idol will be pre-empted tonight because of the POTUS Interruptus.

Man did you watch the POTUS Interruptus last night? With all the clapping it took 2 hours to give a 20 minute speech!
by Chris-2-4 May 03, 2007