Top Definition
Drug originating in russia and having similar properties to GHB. As of March 2005, it is legal and readily available from certain bodybuilding supplement retailers over the interenet. It is also, largely off the public and legislative radar, but has abuse potential sufficient that it will likely one day be regulated.
I hit off a teaspoon of that phenibut and i am feeling nice.
by nate March 18, 2005

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