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
 Blergh
 Haai
 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, 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 raisin' cattle
 Yeah
 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, never mind
 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 we're playin'
 But 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, sayonara
 Ayonawa, hodinawa
 Odinaya, yodinaya
 Yadda-yadda, yah-yah
 Aye-yaah