Running rum is a colloquial term for illicitly brewed and distilled liquor. There are several synonyms to describe the same kind of liquor. These include moonshine, hooch, white lightning, corn liquor, mountain dew, and firewater. These terms are often used to talk about homemade or DIY booze that is made without the proper permits and regulations. Running rums can be dangerous to consume as they are often made without proper hygiene and can contain harmful impurities that can cause serious health risks. While running rum might seem like a fun and adventurous drink to try, it's important to remember that it can be extremely dangerous and should be avoided.