Didn't he also add the condition that it not be about food?
"I told [Kurt] I want to do a parody of 'Smells Like Teen Spirit,' and his first thing was: 'Is it going to be about food?' and I said, 'no, it's going to be about how no one can understand your lyrics.'"
Cobain thought the concept was funny and signed off on it."
https://www.howardstern.com/show/2016/5/17/weird-al-mandator...