n. your friend's other friend that nobody in your circle of friends likes, because they are unattractive or obnoxious. Usually, your friend wants you to be friends with "the dragon". Overall, no one in the circle of friends enjoys a dragon's company.
If "the dragon" is a girl, she is unattractive and tries to hook up with all your friends at parties, where she is the drunkest and loudest person attending. If "the dragon" is a guy, he will also be the drunkest one, and acts like a douche bag and wont stop talking about how much he can drink or bench.
"Dude, have you seen the friend that he brought to this party? She's totally the drunkest one here and acting like a moron"