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You are overthinking it, it's just a misspelling of "FUCK." As spelling FUCM (with the intention of spelling FUCK) in all caps results in Apple's autocorrect to not fix it because its a curse word and because it is in all caps.
"FUCM!"

"What does 'FUCM' mean?"

"Fuck you dumb cunt."
by Nigel_the_best December 13, 2020
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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
by ecogoth December 30, 2020
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2
Stands for "First United Church of Michelle"

Michelle Phelps is also a very religious women and has her own church. If you believe in her and worship her and try hard in everything you do She WILL bless you.
"Where do you go to church?"

"FUCM'

"oh cool"
by MichellePhelps1 December 13, 2009
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