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9.
Someone who, during the course of a conversation or debate, becomes increasingly agitated and ends up ranting and raving.

The best way of tipping such a person over the edge is to start chanting "mad dog, mad dog, mad dog", in unison, quietly at first but growing in volume while tapping your nails on the table top. This will guarantee an hilarious end to the conversation.
Derek, a notorious mad dog screamed: "LOOK, YOU'RE MISSING THE POINT!....".
by Lee Farmie October 15, 2004
 
1.
To stare fixedly at someone in a hostile manner. Generally used to convey anger or disdain, can be a signal that a fight is about to happen.
That guy was mad dogging me after I got his girl friend's number.
by andrew April 25, 2004
 
2.
1. A potent beverage that used to be called Mad Dog 20/20, but the company decided it was better for business to change it to MD 20/20 (yes that is much better -?-)
2. To stare someone down:
A) in response to an initial provocation or
B) to start a fight, or to start shit with another
1. 'Man that Mad Dog had me on tilt last night, sorry if I tried to get with your sister'
2. 'I mad dogged that nuckka until he pussied out', 'I mad dogged that police and that's how I got 50 stitches in my head'
by Dont-Be-Skurrd June 12, 2004
 
3.
Spell it backwards, see what you get.
Mad dog, a creative new insult
by Bob882 September 21, 2004
 
4.
Slang term for Mogen David wine, especially the fortified-wine MD 20/20 variety. The MD stands for Mogen David. It was shortened to MD for their line of bum wines to differentiate between their more respectable (if no less nasty) line of kosher wines.

Contrary to popular myth, there has never been a wine sold under the name Mad Dog.
Got me some Mad Dog last night and got fucked up.

There's a new flavor of Mad Dog called Buck Bunny and it's licorice! Nasty!

Red Grape Mad Dog is 18% alcohol.
by Dr. Badwrench May 27, 2007
 
5.
To stare agressively at another person in order to scare/intimidate
"He was mad dogging me so I knew he had a problem"
by Bazza89 July 21, 2008
 
6.
The most well known person on Saint Louis University's campus. Drinks Miller beer and studies economics. Takes minis.
Has a kick-ass birthday party.
One of the founders of Studio 52.
Hey Maddog, let's do a power hour!
by The Herm February 26, 2004
 
7.
cheap liquor, that may cause you to have violent actions or outburst which is what MD (mad) (dog) 20/20 alchol content.
Burn'a'Nugg favorite liquor.
by burnanugg December 07, 2003