Wiener cousins - term that describes the relationship between two guys who know each other and who have slept with the same chick. Example: if you and I are friends/colleagues/whatever and I fuck Betty, and then you fuck Betty, we are wiener cousins. It doesn't apply if you don't know the other person. Do you have any Wiener cousins? I forgot what the female equivalent is called so we'll call them vag cousins. I have some friends who have all dated the same group of women. I think it's gross. One of my prequalifications for a woman is "cannot have done anything physical at all with anyone I know."