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Abbreviation for 'Fucking impossible, mate'. Coined by a developer in the early nineties, it is still widely used today.

Used to indicate that a(n often simple) development request cannot be completed.
"Can we change the formatting on the grid columns?"

"Nah, that's FIM."
Related Words
fimp FIM FIMA Fime fimbs FIMO fimbo Fimba Fimble Fimple
Fist in Mouth Material--FIM, the action of placing your entire fist in your mouth to prevent uncontrollable spasms of laughter.
Girl on the beach: Have you ever smoked mothballs.
Kevin: Not so much
Girl: I like your hair, not that it means anything, you have a gorgeous face, not that it means anything, and you're all like "Feck off" not that it means anything, I mean, not that it means anything...
Reid: FIM!!!
Kevin: places fist in mouth
FIM by Reid October 17, 2004
Those sunglasses are so fim!
Fim by Shelby Allyn July 21, 2008
Abbreviation (often used in text form) for "Fair is Muff" which in turn is slang for "fair enough". Similar adaptions to fair enough are Fairy's muff and Furry muff, spoken quickly to sound as much like fair enough as possible.
you: hey he's busy Sheening I think, we won't hear back for a few days.
me: FiM.
FiM by Juronron April 29, 2012
Facebook Instant Messenger. A process where two (or more) persons have an absurd conversation using some other unlucky person's Facebook wall. This process gives the victim hundreds of notifications, a giant-ass conversation on their wall and is a great way to pass the time online. Common procedure includes signing in (ex. iliketitties42 has entered chat), using away messages in response to any other post (auto response from iliketitties42: i am currently taking a shit) and signing off (iliketitties42 has left chat). A great prank to pull on uptight people or people who take their lives too seriously.
John Smith

totally!!! i love that shit. lets do it and film it and put it on this kid's wall. god i love FIMing people
July 19 at 10:03am · Comment · Like Unlike · See Wall-to-Wall

Jane Doe
if you do it again i'll eat it out of your ass?
July 19 at 10:02am · Comment · Like Unlike · See Wall-to-Wall

John Smith

dude i just took the biggest shit everrrrr
July 19 at 10:01am · Comment · Like Unlike · See Wall-to-Wall

Jane Doe
ihavetitties43 has entered chat
July 19 at 10:01am · Comment · Like Unlike · See Wall-to-Wall

John Smith

iliketitties42 has entered chat
July 19 at 10:00am · Comment · Like Unlike · See Wall-to-Wall
FIM by Dr Zhivago July 22, 2009