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It is abbreviation for "Hit Me Up".

It means that you want that somebody calls you or texts you an SMS.

Also, this was the most popular Facebook status in 2010. year - 1,600 statuses a day had "hmu" inside of them.
by Mr. Fancyhead January 15, 2011
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7
Stands for Hit Me Up.
This word means "i'm bored so you should talk/chill with me".
A word generally used by fuckboys that have no purpose in life other than to convince a perfectly ordinary girl into sleeping with him.
Fuckboy: I'm bored bby, hmu
Girl: no stfu
by inclusivelilbish December 03, 2015
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