A hoodlum is a term used to describe someone who engages in disorderly or criminal behavior, often associated with gangs or rowdy crowds. The origin of the word comes from the name of an infamous New York City street gang called the "Hoodoo Gang" in the 1800s, which later became shortened to just "hoodlum." Today, the term is used more broadly to refer to anyone who engages in disruptive or criminal behavior.