Ta-na!

The negative of a "ta-da!" but with all the same self-impressed enthusiasm, for sleights of hand or mind which slyly accomplish nothing of the sort they seemed to at first -- i.e., a "ta-da!" combined with a "naaah."
From Reddit.com (7gwbw):

voltron013: From Hawaii you can see China.
7oby: but Japan is in the way?
GeoAtreides: No, Japan is hidden by earth's curvature, so he can see China. Ta-na!
by Monseignore Laszlo December 03, 2008
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Ta na na naa...

The first four notes of Beethoven's Fifth symphony, which are particularly memorable and ominous sounding. Used to indicate potential doom and disaster.
"That guy you just pissed off is a hitman for the mafia. Ta na na naa..."

"Hey, did you hear the world was about to end? Ta na na naa..."

"Hey, honey... I have AIDS. Ta na na naa..."
by FlanlikePlan June 25, 2009
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