Sarcastic retort used in response to a comment that somebody has used to induce excitement or shock. Used with a sense of irony, in saying "woop-de-do", or even "woop-de-freaking-do", the second party is expressing indifference or mild annoyance at the content of the comment made.
Also used when one has excitedly passed on a piece of relatively unenlightening information.
Analogous with "so what", "oh wow!", "who cares", "big deal" and "o rly?".
1: OMFG I just killed Chris on Halo!!!!!1111one!!!!
2: Woop dee do......
1: YAY that hot guy just looked at me!
2: Well woop-dee-freaking-do!
1: Did you know thatDolphins can hold their breath for 666.23763548723 years??
2: Woop-dee-do...
Whoop Dee Do is a term that is used when expressing sarcasm towards a certain event. For example, a bunch of people go crazy over a new pillow being promoted or some crap like that.
Or if a bunch of people went freakin' wild over a new pair of shoes. You probably wouldn't think of it as a big deal, because, well, it's just a pair of shoes. The same thing goes for pillows and other inanimate objects.
*At the mall, a bunch of people get excited as hell over a new mattress*
You: Well, whoop dee do, what's the big deal about a mattress? I mean, it's just a mattress, right?