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1.
It means to forget the new famous word you yourself coined.

Source: Forgettitude was coined by Stephen Colbert, on June 18th's The Daily Show with John Stewart.
Stephen Colbert suffered from a bout of forgettitude, when he saw his own invented word: Truthiness, in the New York Times crossword puzzle of June 18th, 2008.
by bakerpc June 19, 2008