Lyric discussion by thewonkits 

It is PISS. It is referring to the phrase "Piss and moan", which means "to complain". If you look at the official lyrics for the song, it clearly says "Piss". It even sounds like "Piss". "Diss" wouldn't make any sense whatsoever. You're just hearing diss because you don't like the word "piss". Well go fuck yourselves; those are the right lyrics. If you don't like it, deal with it. You don't get to change the lyrics of the song just because you don't like them.

@thewonkits youtube.com/watch

It's 'Diss' - see 2:41

Argh - - youtube, add this - /watch?v=ux0ijnseN-Y

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