the unattractive girlfriends of guys who cheat. usually have very few redeeming qualities, and usually on the pudgy side. crazy-overprotective.
"i know, those guys are just so arrogant, that they always want to be better than their girlfriends, so they date cows, and cheat on them with beautiful girl, and they get away with it because the cows know they are cows in comparison with their gorgeous boyfriends"
i'm hooking up with whats-his-face, but he still hasn't gotten rid of his cowgirl.
cowgirls make our lives so much more difficult.