Just For Banter. A reason for doing something that makes little or no sense.
Joe: Ali, buy that iced coffee!
Ali: Why?
Joe: JFB
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Suzzie: Are you dating Mike?
Alex: No, of course not.
Suzzie: then why did you leave his room at 4:30 this morning??
Alex: We fuck around, he is just one of my JFBs.
Suzzie: ohk!
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Jesus Fucking Bale, referring to Christian Bale's alias, Jesus Bale. (Sprung up from the Golden Globe Awards, where Christian Bale sported a Jesus-like haircut.)
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This whale I fucked got jfbs when i started dating a hot milf
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person 1: Wuu2?
person 2: jfb
Meaning person 2 was just on facebook
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When you cum in your partners mouth while he/her is giving you a blowjob
Him: oh yea im going to do a John F blowjob (JFB)
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Junior fuck boys : any boy under the age of 18 that you know is going to be a fuck boy
"Yo josh is definitely a JFB"
"You look like a JFB"
"JFBs incoming!"