la-di-dah 

That's really not as cool as you think it is.

Person 1: Check out my new Urkel sheets!
Person 2: Well, la-di-dah!

la-di-dah by Adrienne May 23, 2003

ladidah 

the sound a carefree creature makes on a relaxing day when the wind blows softly and the dew drops on the flowers twinkle brightly

OR

A smile with a glob of red goo that is most likely blood

The bunny went ladidah right before it hopped over a cliff.

Kevin's thing is a ladidah.

ladidah by Kasey February 27, 2005