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1.
a meatdick is a dumb, muscley bro that is always worried about one upping other people and outdoing others with his toughness. usually they are overly aggressive as well.
Brad: "Oh yeah josh, you think thats a lift? my ford f150 is lifted at least 3 times that, bro"

josh: "Fuckin brad, quit meatdicking me."
by aria c jalali January 16, 2008
 
2.
The opposite of whiskey dick, resulting from the consumption of excessive amounts of various meats and the excitement and adrenaline that go along with the primal urge to slather one's face in dead animal. Meat dick erections often last more than 4 hours.
That pastrami sandwich gave me massive meat dick
by eluminaught December 31, 2010