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.
by Juronron February 22, 2012
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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
by Dr Zhivago July 23, 2009
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"When did she tell you that?!"
"She was fimming me last night!"
by iloveyouperez October 15, 2009
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Short for 'fimto' derived from the name of a popular multi-fruit drink called vimto.
fimto, the fruitiest word i know!
by zen_patel October 24, 2004
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'MLP FiM' Stands for the show, 'My Little Pony, Friendship is Magic'. Watching the show- any episode, to be specific, can turn a male age 12-30 into a 'brony', or someone who likes the show and contributes to the large fan-base. This show has almost a million fans and is growing daily. DO NOT WATCH THIS SHOW UNLESS IF YOU DON'T MIND BECOMING A DIE HEART FAN. YOU HAVE BEEN WARNED.
"Hey brony, what's up?"
"Nothing, just watching MLP FiM."
"Cool, me too!"

"Who's your favorite character from MLP, FiM?"
"Twilight Sparkle, of course!"
"Silly, that's not how you spell Pinkie Pie!
by TheIntelligentBrony June 3, 2011
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Abbreviation to - My Little Pony: Friendship is Magic

The show that can teach anyone a valuable lesson about friendship in every episode.
Brony #1: "OMG, A NEW EPISODE OF MLP: FiM WAS RELEASED!!"

# On TV #

Dear Princess Celestia,

My friends and I all learned an important lesson this week: Never judge a book by its cover. Someone may look unusual, or funny, or scary. But you have to look past that and learn who they are inside. Real friends don't care what your "cover" is; It's the contents of a pony that count. And a good friend, like a good book, is something that will last forever.

Your faithful student,

Twilight Sparkle
by riskyourrisk May 29, 2014
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