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1.
MD
Doctor of Medicine.

Common title given to doctors.
You can either be a Doctor of Medicine (MD) or a Doctor Osteopathy DO
by HappyHenry35 July 10, 2004
 
2.
MD
Short for MDMA which in turn is short for Methylenedioxymethamphetamine. The most purest, cleanest chewmical in the world. Powdered form of the street drug ecstasy usually found in unclean, unpure pill form. Once you do this, you'll never wanr to touch another pull again. Swear down. However, it has a rather foul, vile taste, so is best taken wrapped in a rizla.
Guy 1 "Yo g you got any pills on ya?"
Guy 2 "Nah mate i don't do that shit, i got some MD though"
Guy 1 "Whats that?"
Guy 2 "The best thing you'll do in your life. Much better than cocaine
Guy 1 "Yeah man i'll try some"

Half an hour alter

Guy 1Nah man this is fuckin brilliant i'm never doin those awful pills again man!
by GF August 22, 2007
 
3.
MD
.:short for maryland:.
the baddest niggaz come from baltimorein MD
by xoxEasSideBabyxox January 03, 2005
 
4.
MD
MD stands for more drinks. It is a rating system used for guys to communicate with one another about how many drinks they need to take before they would fornicate with that specific girl who may not look so great.

Rating system:
1MD: probably still smash when sober
2MD: state of mind is slightly altered but loosening up
3MD: feeling pretty good now 5s are looking like 8s
4MD: damn im drunk every girl is looking good now

1B (1 bottle): Id put it in anything with a hole thats warm, wet, and willing

**Caution: When exceeding the 1B mark may wake up the next morning with a terrible migraine, aching anus, with a guy next to you saying "i had a great night"

or

next to a stripper who's now your wife.

**inspired by the song "1 more drink" by ludacris
guy 1: that girls ugly
guy 2: ya shes a 3md
guy 1: whats a 3md?
guy 2: 3 more drinks before i smash!!
by ShaanDonKhan July 29, 2009
 
5.
md
1. Medical Doctor

2. Short for "most definitely"
1. After High School, if you want to get an MD, you have to spend 12 MORE YEARS in college and medical schools.

2.Haddon: "Oh, my God! Md!"(winks)
by george August 08, 2005
 
6.
M'd
A term parallel to owned but relating to a work situation, where M stands for manager.
A manager has hijacked a colleague on his way out to lunch for a "quick" question:

"oh man Ed just got M'd!"
by barba_papa76 July 30, 2008
 
7.
MD
in terms of drugs:

short for mdma, which is ecstasy, ..
however it's in the form of a powder, usually made by grindin up E pills

is snorted, can be rubbed into gums also for less effect
jojo: how much for sum MD?
benji: £15 for half gram
jojo: i'll take it
by kaitt October 20, 2007