A sexual act involving a yard gnome used as both a vaginal and anal dildo. Usually used while a girl is on her period, but to give a true dirty yard gnome the woman has to also have a case of diarrhea.
Guy 1: Man, my girlfriend is into some freaky things.
Guy 2: That's not a bad thing right?
Guy1: Normally no, but this chick asked for a Dirty Yard Gnome.
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