Had a fling is a colloquial phrase used to describe a brief romantic or sexual encounter with someone. There are many synonyms for this phrase, including had a short-term relationship, had a casual affair, had a one-night stand, had a brief romance, or simply hooked up. These terms suggest that the liaison was not serious or long-lasting, and that it was generally based on physical attraction rather than emotional commitment. While some of these phrases may carry negative connotations, they are often used in a lighthearted or non-judgmental way, especially among young adults who value experiences and experimentation over stability.