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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