Hookup
noun
(sometimes attributive) A connection.
“I need to buy some hookup wire.”
A brief sexual relationship or encounter.
“He met his two most recent partners at bars, and expressed strong ambivalence and dislike of meeting partners online, but reported half a dozen additional hookups with partners met online.”
A sexual partner.
“The predominant way of finding a hookup or sexual partner would be going online.”
Synonyms: fling