Lil Wayne & Ray J -- Hot New Collaboration ... We're Cuckoo for the Coco

Ray J and Lil Wayne's new track is called "Brown Sugar" ... but after one listen, it’s pretty obvious Weezy's also paying homage to some white stuff.

On the track ... Ray J sings the hook, and Tunechi's verse includes this line: “I’m a junkie for your love, girl your body like base/ I got some cocaine on the mirror, you can powder your face.”

Let's face it ... the coke craze reignited last year with O.T. Genasis' hit, "CoCo" -- and Weezy and Ray clearly decided they could cash in too.