A fuckboy with no dick who only gets fucked in the mouth and asshole, but does none of the fucking because he is dickless. He is a cum dumpster who enjoys bukkake’s and golden showers.
Example 1: Rusty is definitely Justin’s dickless fuckboy. I bet Justin doesn’t even use his toilet when Rusty's around.
Example 2: I wonder how many dicks that dickless fuckboy, Rusty, has had flapping in his face at the same time.
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'sMr fuckboy!"
"You need to stop acting like Mr fuckboy"
"We need to talk about Mr fuckboy"