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Reddit/Internet slang stands for: Hold My (Cosmo)politan. This is the female equivalent to HMB-Hold My Beer.

These are the last words before someone does something awesome or gets injured. Not actually said by person but as a comment to a video or gif.
HMC I've got a race to win in heels. HMC(only the acronym in title and it's a video of a drunk women's shenanigans )
by C J breezeway July 28, 2019
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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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3
Person one to person two who are both watching a street fighting friend HMC while I help a friend out
by UnSpamMe August 06, 2019
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4
H.M.C. Stands for "Heavy Metal Club". It's a group/club with members who wear colors just like a motorcycle club, and have by-laws and a hierarchy. Most are local while the bigger, more recognized ones are international and have chapters throughout the world.
Dude, the local H.M.C. were all at the show last night in full regalia.
by Eddie Quist December 14, 2011
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5
AIM , Facebook , Twitter etc. acronym for : hit my cell
by randymaurice July 08, 2010
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