2 definitions by DonBay
When 2 good friends both ejaculate inside the same woman and the sperm joins together into 1. Similar to becoming blood brothers through pricking each others fingers.
by DonBay March 7, 2020
The special ritual of 2 or more close girl friends that become so close that their menstrual cycles syncronise. Once this stage is complete the girls become blood sisters by sissoring each other and exchanging their monthly discharge
Amanda: Hey Helen we've become so close over the last few months that I think we should become blood sisters.
Helen: That sounds amazing I'm due on in a few days
Amanda: Me too!
Helen: That sounds amazing I'm due on in a few days
Amanda: Me too!
by DonBay May 2, 2019