Top Definition
Similar to the fiery dragon, only, while climaxing, the man holds his partner's nose and whispers, "I have syphilis," in her ear. This causes her to spit his manseed out, creating the Mongolian mustache, after which, he punches her in the face, causing her to appear as if she is breathing fire, like a dragon.
"Dude, my girlfriend was pissing me off before we had sex last night, so I gave her the old Mongolian Fire Dragon."
by fuckinfiredragon April 14, 2009

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