Weird Al Yankovic - Smells Like Nirvana

What is this song all about?
Can't figure any lyrics out
How do the words to it go?
I wish you'd tell me, I don't know
Don't know, don't know, don't know, I don't know!
Don't know, don't know, don't know...

Now I'm mumblin' and I'm screaminAnd I don't know what I'm singin
Crank the volume, ears are bleedinI still don't know what I'm singin
We're so loud and incoherent
Boy, this oughta bug your parents
Yeah!

*belch*

hing!

It's unintelligible
I just can't get it through my skull
It's hard to bargle nawdle zouss
with all these marbles in my mouth
Don't know, don't know, don't know, I don't know!
Don't know, don't know, don't know...

Well, we don't sound like Madonna
Here we are now, we're Nirvana
Sing distinctly? We don't wanna Buy our album, we're Nirvana
A garage band from Seattle
Well it sure beats raisin' cattle
Yeah!

moo..

baa...

And I forgot the next verse
Oh well, I guess it pays to rehearse
The lyric sheet's so hard to find
What are the words, oh nevermind
Don't know, don't know, don't know, I don't know!
Don't know, don't know, don't know...

Well, I'm yellin' and we're playinBut I don't know what I'm sayin
What's the message I'm conveyin'?
Can you tell me what I'm sayin'?
So have you got some idea?
Didn't think so
Well, I'll see ya
Sayonara, sayonawa
Ayonawa, hodinawa
Odinaya, yodinaya
Yaddayadda, yaaahyaaah
Ayiyaaaaaah!