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Slang for "Phenazepam", a benzodiazepine drug similar to Xanax (Alprazolam) and Valium (Diazepam). A typical dose is 1mg which is a bit stronger than a 10mg Valium or 1mg Xanax Bar. They are usually sold as 0.5mg or 1mg capsules/pills.

Phennies are quite strong so be wary. It is recommended not to go over 10mgs/day.
Friend A:"Got any bars?"
Friend B:"I've got phennies and they're bangin'! Here's one."
*30 minutes after popping*
Friend A:"Daaaamn, this is chillin'!"
by Phennies May 23, 2012
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Slang for phenibut, a nootropic supplements that works on the GABA receptors in the brain similar to alcohol. Producing effects including anxiety reduction, sociability, and euphoria
Yo when is your bottle of phenny coming in?
by MattyBVisual May 08, 2018
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