The act of being fucked in a church while screaming the Lords name.
I gave my girl the dirty sister rose
Two girls who have dated and had sex with the same guy at different times.
Boys are Eskimo brothers, girls are weasel sisters
Gee those fags are dressing like catholic nuns. I believe it is the Sister Switcheroo.
When two or more girls have hooked up with the same guy
Girl 1: "I hooked uo with Brian last week"
Girl 2: "So did I! Now we are shaft sisters girll"
Girl 1: "PERIODT"
Two friends who are so close their menstrual cycles are in sync.
Girl 1: "Stephanie sure has been hanging around Erica a lot.. Do you think they're vagina sisters yet?"
Girl 2: "I'm not sure but I'd have to say so.."