Let’s see…careful-cautious, protective, safe
oboes-woodwind, wind, reed
blow-wind, air, breathe, exhale
indescribably-obtusely, complicatedly, nonsensical, obscurely
oblivious-distracted, ignorant
Donald’s-duck?
fluff-down
okay, the safe wind blows obtusely on the ignorant duck down.
Got it.
Always use condoms when fellating stupid ducks? So true.
I’m sure I saw something about a “firetruck” in there…
Nope. You guys haven’t figured it out yet!
And you never will. 
Give up yet? 
I’ll give you a hint: the Secret Phrase is like ‘Jump the Shark’ and other Pitted colliqualisms.
The Doobie Brothers are getting back together?
Nope.
Band Name!
Ducks are musical instruments?
Birds of a feather flock together?
Always blow a duck gently?
Aaarrrrggh, Little Bird, you guessed the Secret Code!
Careful oboes blow indescribably, on oblivious Donald’s fluff.
b a n d n a m e
c b o e o b n f
Get it?
It’s such a brilliant code that I invented. 
I wonder who told her…
Brilliant, eh?
Would you mind encoding the first stanza of “The Jabberwocky”?
Hora aderat briligi. Nunc et Slythia Tova
Plurima gyrabant gymbolitare vabo;
Et Borogovorum mimzebant undique formae,
Momiferique omnes exgrabure Rathi.
Oh, you meant using the same system?
Smartass. yourself.