Kanye West I'd 'Smash' All of Kim's Sisters ... According to New Track

Kanye West's new song says he's got "sick thoughts" ... and some of them involve all 4 of his sisters-in-law.

Ye released a brand new track Saturday morning on Twitter -- "XTCY" -- and along with obvious lyrics about ecstasy ... there's a very interesting line about wanting to bang Kim's sisters -- Kourtney, Khloe, Kendall and Kylie.

Sitting in the studio with my man @kanyewest and he said.. "Clark, let that new "XTCY"joint go!!! So.. ENJOY: NEW KANYE WEST.. https://t.co/n2LfhUvMxR

West raps ... "You got sick thoughts? I got more of ’em / You got a sister-in-law you would smash? I got four of them." Then he says they need a bigger hot tub.

Kanye's been very open about his sexual fantasies this week, including talking to Jimmy Kimmel about what kind of porn he prefers ... which led to an offer to direct his own adult film.

Jimmy Kimmel Live!

He's yet to reply to the offer ... but now we have an idea of who he might be looking for at the casting call.

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