The version I knew had a heap of different versions and was sung to the chicken dance, even had a chorus that I can't quite remember, started with "why do they make our joys illegal"

but yeah, here is what I know

My name is Jack,
I'm a necrophilliac
Na Na Na Na *clap clap clap clap*
I get my kicks off fucking dead chicks
Na NA Na Na NA *clap clap clap clap*
I get frustrared when they're cremated.
'Cause a fuck is a must and you can't fuck dust.
Na Na Na NA NA *clap clap clap clap*

My name is Kyle
I'm a pedophile
Na Na NA na *clap clap clap clap*
I get my hots off fucking young tots
Na NA Na Na NA *clap clap clap clap*
Oh it's so mean, when they turn thirteen,
'Cause they get some hair and it grows down there.
Na Na Na NA NA *clap clap clap clap*