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Mephedrone 

4-MethylMethCathinone, chemical compound analogue of Cathinone. Cathinone being the "natural" amphetamine found in Khat plant. In England were it was most popular, it fell out side of any laws. In other countries, it was illegal before it came out due to analogue laws (i.e. USA, and France). And it was banned in other countries after some accidents (deaths, injuries) were related to the compound.
It could be bought on the internet as a plant feeder, with a starting price towards £10 per gram ($15; 11€) but if you bought 20g, the price per gram was towards £7 ($10.7; 7.8€).
In the same way as MDMA, it causes the release of Serotonin in the brain, thus creating the euphoria, and sometimes depression after the come down.
Mephedrone is, since the 29/03/2010, on route to be banned in the UK, because of irresponsible users. Youngsters misunderstood the words "legal high", believing that it was a "safe high", in doing so, Overdoses were common place. Also, the media published every death related to Mephedrone, as they did for ecstasy just before it's ban. Note: the media reports 1/250 deaths from paracetamol or aspirin but 1/1 deaths from Meph.
Also to note: there are more death from alcohol every day then from mephedrone.

Scientific names: 1-(4-methlyphenyl)-2-methylaminopropan-1-one ; 4-methylmethcathinone
Names: Mephedrone ; 4-MMC
Street names: Meow Meow ; Drone ; bubbles
I bought some Mephedrone... I did half a gram with my GF... We loved it!
Mephedrone by Pepys the Cat April 2, 2010
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completely out of it, after excess alcohol or marijuana.
shit man, i was complete mashed last night..
mashed by richard January 25, 2004
Related Words

mashed potato bowl 

The greatest thing to ever happen to KFC.

Consists of a layer of mashed potatoes, corn, fried chicken bites, and cheese.
MOM: Okay, honey, what do you want for dinner?

ME: KFC mashed potato bowl.

DAD: Come on, can't we go out to eat for once??!
mashed potato bowl by Moyoya July 7, 2006

Depressed-Messed 

(adj.) When someone's really screwed up and has personality issues because they're actually depressed about something and don't want to admit it.
"Hey, that kid over there is really weird - he doesn't even smile. He got so angry when I said hi"
"Don't worry about it. He's just depressed-messed"

These mashed potatoes are so creamy. 

From the movie "While You Were Sleeping". The family sits around the holiday dinner table making inane conversation. This line is used as a response when people are talking about useless information. A similar line from the same scene is, "John Wayne was tall." The line is even more powerful if someone else responds with this line.
Person a: "Justin Beiber was at the mall today."
Person b: "I love him, he is so gorgeous!"
Person c: "These mashed potatoes are so creamy."
Person d: "John Wayne was tall."

messed up from the chest up 

when a male or female has a bangin' body but a jacked up face
girl 1: "guuurrrl, he so hot. he got a body like a soccer player!"
girl 2: "yeah, but he messed up from the chest up!"

mashed cornbeef 

when a woman has been out in 100 degree heat, removes her panties and her beef curtains look as if they have been pressed with an iron.
Jenny had the worst case of mashed cornbeef I had ever seen, but I manned up and went in for the kill
mashed cornbeef by wamboozled October 10, 2014