To perform oral sex on a groin with a healthy foliage. Derived from the song and phrase Puff the magic dragon which has its own analogies related to smoking weed
Bro look at her puff the hairy dragon!! Gross!!
When a guy doesn't shave his balls and puts his hairy balls in a girls mouth while he smacks the girls forehead with his penis leaving a purple dragon
Dude my girl and I tried hairy dragon, later her mom asked why was there a purple mark on her forehead