A one night stand refers to having sexual intercourse with a person just one time and not having a relationship with the said person after. Generally, this occurs with someone you just met or have never been with before. It is usually common in urban areas like cities and towns where most of the time is spent working.
(n.) Single performance in one locale, as by a touring theatrical company, before moving on to the next engagement
1 Additional Answer
the term is more commonly understood as a single sexual encounter between individuals, in which neither individual has any immediate intention or expectation of establishing a long-term sexual or romantic relationship.