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1.
To ejaculate in one's mouth, then slap the person across the face hard enough that the semen comes out of the person's nose (like a dragon breathing fire from the nose)
I gave that milf a dragon slap.
by Miguel "Dirty" Sanchez II November 06, 2008
 
2.
when a male has his penis out and proceeds to slap one in the face with it.
yea man, i dragonslapped that bitch
by Tawhirimatea May 10, 2005