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1.
GHB, high proof liquor, antifreeze, or any liquid that gets you crazy-ass drunk.
He done fucked up all night drinking monkey huice on his job!
by Coz August 22, 2003
 
2.
Monkey Juice is heroin in its liquid form mixed with Visine. The drug is kept in the Visine bottle and one or two drops are dropped into the eyes. The heroin is absorbed by the membranes in the eye, causing an almost instant high. This drug is used to subdue kidnap victims so they won't put up a fight. Human Traffickers also use it to kidnap woman often from area just off the Interstate.
Don't accepts Visine from strangers, it could be Monkey Juice!!
by Bulldog August 24, 2008
 
3.
A common term used for coded slang for the word "Cannabis".

This enables weedophiles to talk about there personal use of Cannabis in a public place where many people wouldn't understand the use of it.
Person1: Fancy coming out tonight? I've got some Monkey Juice we can smoke.
Person2: Nah, I dont touch that stuff anymore. Sorry.
by BanzaiBaby May 24, 2010