Mr fuckboy

Mr fuckboy is a common term that can be used to refer to a person who likes to go around messing with girls with, no real intention of keeping a loyal, long term relationship unless friends with benefits is one. It can be used as a code name so, it's easier to talk about someone and not get caught in the act. It can also be used as a simple joke.

"Oh hey, look it's Mr fuckboy!"
"You need to stop acting like Mr fuckboy"
"We need to talk about Mr fuckboy"