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Abbreviation of 'Hot Mess Express'. A term describing the events, places, things surrounding amazing people mostly situated in Los Angeles and San Francisco CA.

Originally used to refer to 'pre-partying' also known as 'car-barring' before hot mess nights out.
"We're going to the club tonight. Get ready to be HMX!"

"It's 4PM on a Tuesday and you're drinking?" "HMX!"
by Hot Mess Xpress May 12, 2011
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