Definition of "hookup"

Grindr’s main purpose is to facilitate hookups that are “spontaneous and intimate,” he said.

2013 March 10, Jenna Wortham, “How Grindr Is Changing the Way We Connect”, in New York Times‎

I bought more bungee cords and made my way to my hookup’s house via slower, more manageable back roads.

2015, Tyler Oakley, Binge, Simon and Schuster