To set an appointment to have sex with a man. Women make dick appointments. Also it is purely to fuck, no "feelings" are involved.
"Tommy asked me to come over to his place. I asked him if he wanted to fuck me. He said yes. so I told him to come to my place and he did." ...thats a dick appointment
Trying to select an app on a smartphone or tablet, but by touching the wrong icon, another app is selected. Instead of closing the incorrect app, the user finds the app pleasing and stays with it, forgetting the intended app.