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M Kat is a nickname for Mephedrone, also known as 4-methylmethcathinone (4-MMC), is a stimulant and entactogen drug of the phenethylamine, amphetamine, and cathinone chemical classes.

Mephedrone is reported as causing effects described as a cross between those of methamphetamine and MDMA ("Ecstasy"), producing euphoria, stimulation, and empathy. It generally sells for a higher price than MDMA but is cheap to produce meaning that manufacturers are making "huge amounts of money" from selling the drug
Man, I snorted a ton of M Kat last night, i was off my tits.
by MrDBamboo December 01, 2009
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Mar 1 Word of the Day
One who has a mania for music.
I am a melomaniac.
by Larstait November 14, 2003
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2
A new legal drug many teens use, like coke it's snorted or smoked and looks almost identical to it, although it's actually good plantfood.
The drug gives a short rush and can affect eyesite, mindset and can make the user feel like shit for the coming days. Best kept for the rubber green plant in the corner of your bedroom.
"Dude i got some mkat for the weekend!"

"Awesome man, my plant loves that shit! Got any real drugs for us though?"
by RobJoness March 10, 2010
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3
nickname from George W. Bush for Mark McKinnon
M-Kat was chief media advisor to Dubya for his gubernatorial and presidential campaigns.
by Coop Dupe August 23, 2020
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4
Nickname for Mayor Kathy Taylor of Tulsa, OK.
I support MKat in her decision to move city hall.
by Second Tony May 23, 2008
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5
when a drunken friend begins falling down and getting up repeatedly, he resembles a meercat, and is given the title of Mkat.
holy shit, did you just see that Mkat behind my couch?
by Nick Midas January 21, 2004
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