(I Got A) Catholic Block lyrics

[Thurston]
I got a catholic block
inside my head
i let it go to work
bring it all back home

it serves you right
and i can motor down
you got to earn your freedom
get it on my own

i just live forever
there just is no end
i just trust the oppression
like i trust your friends

i got a catholic block
inside my head
i let it play around
iron to gold

come back to me awhile

i got a catholic block it's around my head
i got a catholic block it's blood orange red
i got a catholic block do you like to fuck?
i got a catholic block i guess i'm out of luck

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What do you think is the meaning of (I Got A) Catholic Block by Sonic Youth?