Whiskey dick is a slang phrase to refer to the inability to produce an erection after drinking alcohol. It is used as a synonym for a flaccid penis.
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Whiskey dick is not specific to whiskey, as the condition can occur during the overconsumption of any type of alcohol. It does, though, refer specifically to erectile dysfunction (ED) whery the individual cannot achieve or maintain an erection long enough to engage in sexual intercourse. The individual need not be intoxicated, but the consumption of some kind of alcohol is a necessity for the ED to be referred to as whiskey dick rather than simply impotence.