Illegally distilled liquor, so named because much of the manufacturing process often is conducted without artificial light at night when the moon is shining
Distilled spirits produced in an unlicensed, unregulated still and without payment of taxes, and hence, illegal Seldom aged, and produced from anything that will ferment, moonshine is often a health hazard
disapproval If you say that someone's thoughts, ideas, or comments are moonshine, you think they are foolish and not based on reality. As Morison remarks, the story is pure moonshine. = nonsense