Had fling is a term used to describe a brief romantic or sexual encounter. Synonyms for this phrase include one night stand, hookup, affair, dalliance, liaison, tryst, and fling. Each of these words carries a slightly different connotation. For example, a one night stand typically refers to a sexual encounter with no expectation of a future relationship, while an affair suggests a more ongoing and secretive relationship outside of one's primary partnership. Ultimately, the choice of synonym depends on the context and level of commitment implied in the particular situation. Whatever term is used, it is important to always prioritize communication and consent in romantic and sexual encounters.