Weird Al--"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, oh no
Don't know, don't know, don't know...

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

Its unintel-ligible
I just can't get it through my skull
Its hard to bargle nawdle zouss
With all these marbles in my mouth
Don't know, don't know, don't know, oh no
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 raising cattle
Yeah

And I forgot the next verse
Oh well, I guess it pays to rehearse
The lyric sheets so hard to find
What are the words? oh, nevermind
Don't know, don't know, don't know, oh no
Don't know, don't know, don't know...

Well, I'm yellin' and were playin'
But I don't know what Im sayin'
Whats 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, sayonara
Ayonawa, odinawa
Odinaya, yodinaya
Yaddayadda, yaaahyaaah
Ayaaaaaah!