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Just For Fun. Something done just for the fun of it.
-Hey, guess what!
-I decided to go to work today jff!
by Maddie March 11, 2005
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Acronym for "Just Facebook Friends", similar to and playing off the term BFF but with a generally negative connotation. This applies to those people whom you rarely see in real life, but know everything about thanks to their frequent social network updates. Alternately used to downplay a relationship with a person you do not wish to be associated with publicly.

Alt. Form "J.F.F.F.L", pronounced "Jiffle", meaning "Just Facebook Friends For Life".
Steve: "I can't believe you hang out with Tricia!"
Nicole: "No way... we're JFFs."
by LawZombie December 18, 2011
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"just for fuck" the concept of doing something, just for the sole purpose of fucking.
"I think im going to get back together with her.." "why?" "JFF"
by theogbt October 27, 2011
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Just Fucking Fat

When overwhelmed with All the different porno and PC terms such as healthy, thick, meaty, beefy, plump, stout, pudgy, chubby,FUB, chob, zaftig, BBW, BFG, BBM, BHM VLW, ad nauseum; one finally realizes that these people are JFF.

Let's all say it together, "Just Fucking Fat."
BBW? Naw dawg, she's JFF.
by elmoloveftl October 13, 2011
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Just for fuck sake. An extension of the melodramatic, and somewhat boring acronym ffs. Expresses a greater magnitude of anger than ffs, often used in response to something a stupid, pussy white boy said.
Harry: I fucked your mum
Alex: Jffs
by Swagzilla12 March 28, 2015
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Steve: just tell your father you had sex
Cal: cant dude, hes not like your father, my father's got a JFF!
Cal: Word up, son!
by Mystikalizer June 28, 2010
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