"Tweedily-Dee" is a song from the episode "Tale of the Mighty Knights: Part 2".
Tasha: Tweedily-dee! Tweedily-doo! I'm the Flighty Fairy, and who are you? Tweedily-doo! Tweedily-dee! What I find in this forest is for me... that's just how it has to be! I'm the Flighty Fairy, so tweedily, tweedily-dee!
Tyrone: What if we tell you that's the good king's egg?
Tasha: He can walk here and get it on his own two legs!
Uniqua: But if we command you to give it to us?
Tasha: It's not gonna happen, so don't even fuss!
Austin: And what if I kneel down and say 'pretty please'?
Tasha: I will wave my magic wand and drop you in the tree...
Tasha: Tweedily-dee! Tweedily-doo! I may be really little, but there's so much I can do! Tweedily-doo! Tweedily-dee! I'm so glad I found this little Eggy! He's just the friend for me! He fills me up with glee, so tweedily, tweedily-dee!
Uniqua: What if we tell you that we won't go away?
Tasha: Well, I'll cook up a rainstorm and you'll have a crummy day!
Austin: What if we grab the egg when you're in bed?
Tasha: That won't be so easy when you're standing on your head!
Uniqua: You must... surrender the egg!
Tasha: No, I won't!
Tyrone: We must... recapture the egg!
Tasha: No you don't! If you take one more step over here, I will waggle my wand and you will disappear!
Uniqua and Tyrone: Hey! Bring us back!
Tasha: Tweedily-dee! Tweedily-doo! I think it's getting time to skedaddle and skidoo! Tweedily-doo! Tweedily-dee! You just can't mess with the Flighty Fairy! I'm just too good, you see? So tweedily-dee... tweedily, tweedily-dee! Tweedily-dee! Tweedily-dee! Tweedily-dee...