When there is no doo in your girls boo, just jam two fingers from both hands(double barrel)in her butt, and then swish them around in her mouth. Then, smear it across the top of her lips from both sides, and you have yourself a dirty gallegos.
Giving your girl a Dirty Gallegos gives the appearance of a light blonde mustache on her face.
When two males of the same family tree engage in intercourse or oral sex.
Ah Ramiro and Anthony pulled a dirty gallegos last weekend at the family reunion.