The fancy way of saying liquid courage , pot-valor is the perfect word to describe how imbibing a few ounces of something can make a very bad idea seem like something you should definitely do right now. Inshort, this is alcohol induced courage.
Another term related to alcohol is dipsomania which means an uncontrollable craving for alcoholic liquors.
Example
Everyone got impressed with the way in which he debated with the policeman on duty but later only realized that it was just manifestation of pot-valor
He could not complete the de-addiction and ended up being a dipsomaniac