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Mango Juice is code for marijuana, used when in a public situation that would otherwise call attention to a discussion about weed, Mary Jane, or MJ.
"Hey I herd you sell mango juice, can I get some?"

"Yo wanna buy some mango juice?"

"Damn dogg I had so much mango juice yesterday.. I'm fryed.."
by K-YO.G. August 11, 2009