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1.
Anything that President Barack Obama does or any challenge that he is faced with.
"President Obama's trip to China was unprecedented."

"When President Obama passed the unprecedented stimulus package, it was because of an unprecedented economic crisis."

"Obama is faced with the unprecedented dilemma of inheriting two unprecedented wars. I'm sure whatever he does to handle them will be unprecedented... Even if it's a troop surge."

"I can't wait to see what unprecedented method he comes up with to deal with the unprecedented deficit."
by haaaaaze November 25, 2009
 
2.
Stemming from the culture of boolandishness, unprecedented is frequently used in scenarios that have been previously unexperienced, and\or have newfound meaning. The term is best applied during instant messenger conversation and must be spelled out ideally with three spaces between each letter to signify the unfounded satisfaction and glory.
1) The lerk of the day was absolutely U N P R E C E D E N T E D.

2) There were many unprecedented lerks that we succombed to throughout the day.
by Orig O nal November 21, 2006