An actual acronym among the mass of Millennial abbreviations--WTF, OMFG, ad nauseum--mistaken as such.

The word fomo (not to be mistaken with its homophone, Faux-mo) stands for “fuck off; move on.” Its lack of semicolon is comparable to other minor details implied—though not included—in the transference of countless other phrases to acronyms. ex: the word “of” in OPEC.

Created as an addition to the lexicon of netspeak, fomo is ideal for a thread in which some twatrot insists on saying the same thing with slightly different phrasing under the auspices that this time s/he’ll make everyone else “see the light.” A mod or community member who’s had enough might chime in ‘”Dude, we all heard you. Feel free to fomo. Matter of fact, I insist.’

However, the inception of fomo came about in direct response to some Millennials with the attention span of gnats, who—despite the fact they’ve never read an entire book in their lives—still feel the inherent need to exert the time and energy to snark that a 5-paragraph post was tl; dr.
(via chat):

‘Fecking shit. I spent all morning writing a blog just to log-in tonight and find four lame-ass comments in response!’

‘dang, maing. 4 cmnts means u affected 4 ppl. imagine how I feel 2 get cero?’

‘Yeah, well imagine how *I* feel when all four say ‘tl;dr’?’

‘worrrrrst. it's like, whyd they feel the need 2 tell u that? bitches need to just fomo—and fast.’

‘Agreed. I don’t have to stop some author in his tracks and go, ‘Hey, I didn’t read your book.’

‘Totez.’

‘O.K. You can speak in English now…”
by clintcatalyst July 10, 2008

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Originating in 1994, the "Feast of Maximum Occupancy" is an annual gathering held in the city of Richmond Heights, Missouri between the Ides of March and St. Patrick's Day, or on the nearest Saturday to St. Patrick's Day. The stated goal is to gather as many persons into the building as possible, hence "maximum occupancy", though it is believed the event originated as a celebration of achieving maximum roommate occupancy and hence lowering rent payments to the smallest possible amount.
Hey, FOMO is this Saturday, let's go!
by Lisa Mestel March 17, 2006

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Pronunciation (rhymes with homo); pop culture acronym: an individual who is obsessed with all aspects of emerging cellular phone technology esp. Blackberry and I-Phone, slang- a phone geek that unlocks or hacks cell phones and PDA's.
John is a true FOMO, he has the new I-Phone app before it's even available.
by gp1069 September 14, 2009

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A fucking moron
Tell that FoMo, you have to cook pork before you eat it.
by TrunkJunker June 14, 2009

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A Fomo is a glove slapping mofo
hey jonny why dont you fuck off you Fomo.
by joe jackson(mojo jojo) September 25, 2008

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A particularly camp person who acts gay but is in actual fact straight. Abbreviation of 'faux-homosexual'.
"That guy in engineering is such a fomo!"
by Jamie Benning August 28, 2007

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1) A fake homosexual - someone who carries certain affectations or embodies certain personality characteristics and/or behaviors usually associated with male homosexuals.
2) A homosexual male who purposefully enhances his 'image' by adopting behaviors associated with more outrageous 'out' individuals.
Person #1 to affected individual: "You're such a Fomo"
by Roma E June 05, 2006

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An abbreviation for: "for more information."
FOMO, check out this website.
by ar jay April 06, 2006

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