Whilst Nirvana were in Brazil for two large stadium shows in January 1993 they also secretly booked time in local studio to work on some new material, mostly songs that would end up on 1993 album 'In Utero'. At one point in the session, with nobody else around, Grohl decided to record something himself for fun, a cover of 'Onward Into Countless Battles', a track by Swedish death metal band Unleashed.
"Nobody was there, so I took this riff and recorded it on my own" he told a Swedish magazine in 2005. He also mentioned that the track was very nearly released on the 2004 Nirvana box set 'With The Lights Out', the people assembling the set unaware of it not being an original song until Grohl got wind of the plans. "I was like, 'No, no, no, that's an Unleashed song, you can't use that!' It would have been really funny. It was THAT close."
Grohl recorded all of the instruments for the song but didn't record the vocals, instead electing to just grunt the word 'Meat' at points in the track, Cobain also joining him on backing vocals. This led to the song commonly being mislabelled as "Meat" or "Dave's Meat Song" when it was leaked to fans before they were also corrected on it's true origins.