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...
A delicious fat ass that you see one time in your life. It can be replaced if you see one that is of higher quality in the future, but it must be greatest ass you ever seen by your eyes.