micro-dater 

A micro-dater is one who dates for the short term simply for the sake of dating; a micro-dater will have numerous partners over a short amount of time and will have no qualms about continuing this pattern.
There may be commitment issues and the suggestion of settling down or dating anyone long-term will cause the micro-dater to disengage from the situation.

"Wow, is that Frank's third girlfriend this month?"
"Yeah, but it should surprise you, he's a chronic micro-dater."

micro-dater by Schipotle April 5, 2010

micro-date 

An extremely brief fantasy about a person, generally of a sexual nature, lasting only a few seconds. Micro-dates typically occur with complete strangers in passing but can also occur with friends and acquaintances.

The beautiful woman stepped into the elevator and Brad immediately had a micro-date.

micro-date by Hemmingwayz November 23, 2016

microdate

A very short date with a finite end point.

'I had a great microdate with this guy, it lasted 20 minutes before I had to run to meet....'

'Let's schedule a microdate. I only have time after work but before dinner with friends.'

microdate by songtree July 26, 2017