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1.
A variation of whoopdeedoo, except a lot more harsh and sarcastic. When someone says something that has no point whatsoever use this word. This word is pronouced the way it is written.
"I have a dollar" says Vincent
"Whoop-dee-fucking-doo" says Patrick
by Pateb Serasleb May 18, 2004
 
2.
another term for "I don't really give a shit" - meaning you don't really care
"Did you know that Sharons Mothers next door neighbours nephew won the Lottery?"

"Whoop Dee Fucking Doo!"
by E Mayler August 21, 2008