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A girl, usually a hick and or some sort of trash who can be seen: Riding in muddy trucks while wearing a rebel cap, chewing tabacco, scratching their vagina/rubbing her vagina in the dirt after urinating in the bushes, flaunting a dirty thong,or posses any other feature one may feel is "dirty". The McGirk is just a cool ending.
"Hey Ty that girl looks like dirt"

Girl proceeds to turn around and her shirt says "I love dirt"

"holy crap Ty she is Dirt McGirk"
by David M. D December 03, 2007
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